Review Request: Fix crashing when using tools on empty image

[Torio Mlshi]

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http://git.reviewboard.kde.org/r/103003/
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Review request for Calligra.


Summary (updated)
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Fix crashing when using tools on empty image


Description (updated)
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When image is empty (has no layers), color picker & move tools caused crashes when using. This patch adds checking if currentNode() returns 0. If so, no action is done.


Diffs (updated)
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  krita/plugins/tools/defaulttools/kis_tool_colorpicker.cc 006aa78 
  krita/plugins/tools/defaulttools/kis_tool_move.cc 1ee0baa 

Diff: http://git.reviewboard.kde.org/r/103003/diff/diff


Testing
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Thanks,

Torio Mlshi

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