Review Request 121468: Fix crash when right-clicking a Part entry

[Elvis Angelaccio]

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https://git.reviewboard.kde.org/r/121468/
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Review request for KDE Utils and Raphael Kubo da Costa.


Bugs: 341809
    http://bugs.kde.org/show_bug.cgi?id=341809


Repository: ark


Description
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My commit ed3ea7d introduced a bug that we didn't catch. When previewing an archive inside another archive, `factory()` returns a null pointer and so there is a segfault while attempting to show the context menu (after right-clicking an entry of the previewed archive).
The bug is trivally fixable by checking the validity of the `factory()` pointer, but this way the context menu is not showed at all. I think this should be fine, since we are talking about a read only preview of the archive and thus the only enabled action within the context menu would be `Preview`.


Diffs
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  part/part.cpp 09fe1cbfcc7f4345fe12932055dcb041f50abb7b 

Diff: https://git.reviewboard.kde.org/r/121468/diff/


Testing
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Compile and test by previewing an archive inside another archive: now the crash is gone and nothing happens after right-clicking one of its entry.


Thanks,

Elvis Angelaccio

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