Fix backtrace on printing localized (non-ascii) error message in PLCGenerator.

traceback:
File "C:\Beremiz\targets\st\beremiz\..\..\..\beremiz\beremiz\BeremizIDE.py", line 811, in OnMenu
getattr(self.CTR, method)()
File "C:\Beremiz\targets\st\beremiz\..\..\..\beremiz\beremiz\ProjectController.py", line 1134, in _Build
IECGenRes = self._Generate_SoftPLC()
File "C:\Beremiz\targets\st\beremiz\..\..\..\beremiz\beremiz\ProjectController.py", line 746, in _Generate_SoftPLC
if self._Generate_PLC_ST():
File "C:\Beremiz\targets\st\beremiz\..\..\..\beremiz\beremiz\ProjectController.py", line 763, in _Generate_PLC_ST
self._getIECgeneratedcodepath())
File "C:\Beremiz\targets\st\beremiz\..\..\..\beremiz\beremiz\PLCControler.py", line 466, in GenerateProgram
errors.append(str(ex))
<type 'exceptions.UnicodeEncodeError'>: 'ascii' codec can't encode characters in position 0-9: ordinal not in range(128)
Fix backtrace on printing localized (non-ascii) error message in PLCGenerator.

traceback:
File "C:\Beremiz\targets\st\beremiz\..\..\..\beremiz\beremiz\BeremizIDE.py", line 811, in OnMenu
getattr(self.CTR, method)()
File "C:\Beremiz\targets\st\beremiz\..\..\..\beremiz\beremiz\ProjectController.py", line 1134, in _Build
IECGenRes = self._Generate_SoftPLC()
File "C:\Beremiz\targets\st\beremiz\..\..\..\beremiz\beremiz\ProjectController.py", line 746, in _Generate_SoftPLC
if self._Generate_PLC_ST():
File "C:\Beremiz\targets\st\beremiz\..\..\..\beremiz\beremiz\ProjectController.py", line 763, in _Generate_PLC_ST
self._getIECgeneratedcodepath())
File "C:\Beremiz\targets\st\beremiz\..\..\..\beremiz\beremiz\PLCControler.py", line 466, in GenerateProgram
errors.append(str(ex))
<type 'exceptions.UnicodeEncodeError'>: 'ascii' codec can't encode characters in position 0-9: ordinal not in range(128)


Close #67

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