Review Request: Do not crash in GrepOutputModel

[Kevin Funk]

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http://git.reviewboard.kde.org/r/107548/
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Review request for KDevelop.


Description
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Do not crash in GrepOutputModel

In case there are no matches you can still trigger the replace.
=> Crash in GrepOutputmodel because it assumes the root item of the
model is still there.

Fixes:
* Disable the replace button in case there are no matches
* Do not crash in GrepoutModel in case the root item is invalid (call
  safety)

BUG: 303329


Diffs
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  plugins/grepview/grepoutputmodel.cpp b9d45b1b1cd59ffff246c8fc797267d22e2858c1 
  plugins/grepview/grepoutputview.cpp e19fac1fac93be24238422a410d26e1e6ed07dcc 

Diff: http://git.reviewboard.kde.org/r/107548/diff/


Testing
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Thanks,

Kevin Funk

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