fix wrong Row number in DiscoveryDialog.py that caused following traceback:

Traceback (most recent call last):
File "/home/beremiz/beremiz/ProjectController.py", line 1536, in _Connect
dialog = DiscoveryDialog(self.AppFrame)
File "/home/beremiz/beremiz/dialogs/DiscoveryDialog.py", line 124, in __init__
self._init_ctrls(parent)
File "/home/beremiz/beremiz/dialogs/DiscoveryDialog.py", line 121, in _init_ctrls
self._init_sizers()
File "/home/beremiz/beremiz/dialogs/DiscoveryDialog.py", line 73, in _init_sizers
self._init_coll_ButtonGridSizer_Growables(self.ButtonGridSizer)
File "/home/beremiz/beremiz/dialogs/DiscoveryDialog.py", line 64, in _init_coll_ButtonGridSizer_Growables
parent.AddGrowableRow(1)
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/_core.py", line 15343, in AddGrowableRow
return _core_.FlexGridSizer_AddGrowableRow(*args, **kwargs)
PyAssertionError: C++ assertion "!m_rows || idx < (size_t)m_rows" failed at ../src/common/sizer.cpp(1967) in AddGrowableRow(): invalid row index

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// import Nevow.Athena

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function init() {

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  Nevow.Athena.Widget.fromAthenaID(1).callRemote('HMIexec', 'HMIinitialisation');

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}

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WebInterface.PLC = Nevow.Athena.Widget.subclass('WebInterface.PLC');

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WebInterface.PLC.method(

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	 'updateHMI',

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	 function (self, data) {

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	   d = self.callRemote('getPLCElement');

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	   d.addCallback(

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			 function liveElementReceived(le) {

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				d2 = self.addChildWidgetFromWidgetInfo(le);

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				d2.addCallback(

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						function childAdded(widget) {

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						var node = self.nodeById('content');

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						node.replaceChild(widget.node, node.getElementsByTagName('div')[0]);

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						init();

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						});

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				});

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	   });

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Divmod.Base.addLoadEvent(init);