Fix crash if LD input contact isn't connected

Traceback (most recent call last):
File "/home/developer/WorkData/PLC/beremiz/beremiz/BeremizIDE.py", line 339, in OnMethod
obj.CTR.CallMethod('_'+meth)
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 1996, in CallMethod
getattr(self, method)()
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 1134, in _Build
IECGenRes = self._Generate_SoftPLC()
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 746, in _Generate_SoftPLC
if self._Generate_PLC_ST():
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 763, in _Generate_PLC_ST
self._getIECgeneratedcodepath())
File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCControler.py", line 456, in GenerateProgram
self.ProgramChunks = GenerateCurrentProgram(self, self.Project, errors, warnings)
File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 1762, in GenerateCurrentProgram
generator.GenerateProgram()
File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 478, in GenerateProgram
self.GeneratePouProgram(pou_name)
File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 260, in GeneratePouProgram
program = pou_program.GenerateProgram(pou)
File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 1718, in GenerateProgram
self.ComputeProgram(pou)
File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 1028, in ComputeProgram
self.GenerateBlock(instance, block_infos, body, None)
File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 1144, in GenerateBlock
expression = self.ComputeExpression(body, connections, executionOrderId > 0)
File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 1373, in ComputeExpression
paths = self.GeneratePaths(connections, body, order, to_inout)
File "/home/developer/WorkData/PLC/beremiz/beremiz/PLCGenerator.py", line 1344, in GeneratePaths
elif isinstance(result[0], list):
IndexError: list index out of range


Close #70

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// import Nevow.Athena

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// import Divmod.Base

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function updateAttr(id, param, value) {

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  Nevow.Athena.Widget.fromAthenaID(1).callRemote('HMIexec', 'setattr', id, param, value);

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}

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var svguiWidgets = new Array();

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var currentObject = null;

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function setCurrentObject(obj) {

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	currentObject = obj;

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}

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function isCurrentObject(obj) {

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	return currentObject == obj;

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}

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function getSVGElementById(id) {

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	return document.getElementById(id);

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}

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function blockSVGElementDrag(element) {

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	element.addEventListener("draggesture", function(event){event.stopPropagation()}, true);

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}

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LiveSVGPage.LiveSVGWidget = Nevow.Athena.Widget.subclass('LiveSVGPage.LiveSVGWidget');

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LiveSVGPage.LiveSVGWidget.methods(

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    function handleEvent(self, evt) {

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        if (currentObject != null) {

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            currentObject.handleEvent(evt);

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        }

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    },

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    function receiveData(self, data){

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        dataReceived = json_parse(data);

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        gadget = svguiWidgets[dataReceived.id]

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        if (gadget) {

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        	gadget.updateValues(json_parse(dataReceived.kwargs));

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        }

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        //console.log("OBJET : " + dataReceived.back_id + " STATE : " + newState);

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    },

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    function init(self, arg1){

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        //console.log("Object received : " + arg1);

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        for (ind in arg1) {

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            gad = json_parse(arg1[ind]);

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            args = json_parse(gad.kwargs);

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            gadget = new svguilib[gad.__class__](self, gad.id, args);

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            svguiWidgets[gadget.id]=gadget;

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            //console.log('GADGET :' + gadget);

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        }

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        var elements = document.getElementsByTagName("svg");

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        for (var i = 0; i < elements.length; i++) {

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        	elements[i].addEventListener("mouseup", self, false);

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        }

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        //console.log("SVGUIWIDGETS : " + svguiWidgets);

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    }

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);