crash then compile wis not connected contact in ladder

[Александр Булатов]

No description provided.

[Andrey Skvortsov]

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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