Review Request 129600: segfault when ExpressionVisitor's lastType is nullptr

[Leslie Zhai]

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https://git.reviewboard.kde.org/r/129600/
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Review request for KDevelop and Kevin Funk.


Repository: kdev-ruby


Description
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When using kdevelop import redmine (a bug tracker written in ruby http://www.redmine.org/) segfault when ExpressionVisitor's lastType is nullptr, so I simply added the check

```
if (ev.lastType() != nullptr)
```


Diffs
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  duchain/builders/declarationbuilder.cpp 841fc2e 

Diff: https://git.reviewboard.kde.org/r/129600/diff/


Testing
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import redmine


Thanks,

Leslie Zhai

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