beremiz

file isExecutable
make attribute CFLAGS and LDFLAGS optional and add default empty value

Actually CFLAGS and LDFLAGS are not required and can be empty.
Without default empty value if target platform in project settings was
set to "Linux" CFLAGS and LDFLAGS was initialized with NoneType.
The result was broken build and it wasn't to save/load project with
such settings.

Traceback (most recent call last):
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 956, in _Build
if not builder.build() :
File "/home/developer/WorkData/PLC/beremiz/beremiz/targets/toolchain_gcc.py", line 96, in build
Builder_CFLAGS = ' '.join(self.getBuilderCFLAGS())
TypeError: sequence item 0: expected string, NoneType found
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.plcopen.org/xml/tc6.xsd"
xmlns:xhtml="http://www.w3.org/1999/xhtml"
xsi:schemaLocation="http://www.plcopen.org/xml/tc6.xsd">
<fileHeader companyName="beremiz"
productName="Beremiz"
productVersion="0.0"
creationDateTime="2008-12-14T16:21:19"/>
<contentHeader name="Beremiz Python Support Tests"
modificationDateTime="2009-09-26T18:14:56">
<coordinateInfo>
<pageSize x="1024" y="1024"/>
<fbd>
<scaling x="0" y="0"/>
</fbd>
<ld>
<scaling x="5" y="5"/>
</ld>
<sfc>
<scaling x="5" y="5"/>
</sfc>
</coordinateInfo>
</contentHeader>
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<type>
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</type>
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<type>
<BOOL/>
</type>
</variable>
<variable name="DigitalBit1">
<type>
<BOOL/>
</type>
</variable>
<variable name="DigitalBit2">
<type>
<BOOL/>
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<variable name="DigitalBit3">
<type>
<BOOL/>
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<variable name="Compteur">
<type>
<derived name="TextCtrl"/>
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<variable name="Temoin">
<type>
<derived name="Led"/>
</type>
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<configuration name="config">
<resource name="res_pytest">
<task name="pytest_task" interval="t#100ms" priority="0"/>
<pouInstance name="pytest_instance" typeName="main_pytest"/>
</resource>
</configuration>
</configurations>
</instances>
</project>