Review Request 108728: Avoid crash if there is currently no patch

[Eli MacKenzie]

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http://git.reviewboard.kde.org/r/108728/
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Review request for KDevelop.


Description
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Merely toggling the Patch Review plugin off and on was sufficient
to cause a segfault. This could be the cause of the crash in the
cited bug report as my backtrace had the same last 22 lines.


This addresses bug 306176.
    http://bugs.kde.org/show_bug.cgi?id=306176


Diffs
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  plugins/patchreview/patchreviewtoolview.cpp 8239dc2a3a5c748ba46027a99aae57b6bfb0ad4f 

Diff: http://git.reviewboard.kde.org/r/108728/diff/


Testing
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Thanks,

Eli MacKenzie

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