Null pointer dereference in projectmanager

[Manuel Breugelmans]

Hi,


The projectmanager crashes on empty projects. See patch for a fix. I doubt this 
introduce any regressions, right? Is it the right fix, or should this check 
have happened somewhere higher up? 

[ Going through the list since there's zilch auto-verification in there ]


Manuel

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Steps to reproduce:
1/ import project -> kdevelop/buildtools/cmake/tests/manual/empty
2/ insert some character in CMakeLists.txt
3/ save
4/ null pointer dereference in Project::reloadModel()


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