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

# SOME DESCRIPTIVE TITLE.
# Copyright (C) is 21st century inquisition
# This file is distributed under the same license as the Beremiz package.
# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
#
msgid ""
msgstr ""
"Project-Id-Version: Beremiz 1.1\n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2012-09-08 00:41\n"
"PO-Revision-Date: 2012-09-07 10:53+0100\n"
"Last-Translator: \n"
"Language-Team: \n"
"Language: \n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"X-Poedit-Language: French\n"
"X-Poedit-Country: FRANCE\n"
"X-Poedit-SourceCharset: utf-8\n"

# c9c5ea5d04e64cb6a54fcda391cb4929
#: ../../manual/install.rst:2
msgid "Beremiz installation"
msgstr "Installation de Beremiz"

# 3f78e50eff364a0abbfcb8cf9a0a68da
#: ../../manual/install.rst:5
msgid "Windows"
msgstr "WIndows"

# 963db7a095b246d68c4a51163b441952
#: ../../manual/install.rst:6
msgid "Download installer, install."
msgstr "Téléchergez l'installeur, exécutez le."

# 87380693201647979e3c0d0527205575
#: ../../manual/install.rst:9
msgid "Linux"
msgstr "Linux"

# 0c4d6e88a20248b9bc3b167cf120c318
#: ../../manual/install.rst:10
msgid "Pre-requisites::"
msgstr "Pre-requis::"

# ced14d340a194a2b9f53b8e6c34d6804
#: ../../manual/install.rst:16
msgid "Prepare::"
msgstr "Préparation::"

# f555cb10ef0d42d6bbbe2f85f0763057
#: ../../manual/install.rst:21
msgid "Get Source Code::"
msgstr "Obtenir le code source::"

# 1d5926626d3b49d891529b9fc687fec3
#: ../../manual/install.rst:29
msgid "Build MatIEC compiler::"
msgstr "Compiler le compilateur MatIEC::"

# 166772d03f6f4d67abb4ed849fc3f6d8
#: ../../manual/install.rst:35
msgid "Build CanFestival (optional)::"
msgstr "Compiler CanFestival::"

# 39a65c2b7ca747438a15d31bd4a40a4f
#: ../../manual/install.rst:47
msgid "Launch Beremiz::"
msgstr "Lancer Beremiz::"