Review Request 111047: Handle edge cases when going back/escape

[Shantanu Tushar]

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http://git.reviewboard.kde.org/r/111047/
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Review request for Plasma, Akshay Ratan and Sinny Kumari.


Description
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At places we assume that there always be a valid browsing backend. In many situations this isn't true, which is exactly what this patch handles.


Diffs
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  mediaelements/mediabrowser/MediaBrowser.qml e7aa109 
  shells/newshell/package/contents/ui/mediacenter.qml d533b60 

Diff: http://git.reviewboard.kde.org/r/111047/diff/


Testing
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Tested some scenarios that I could think of. Please test few scenarios and see if this works.
Akshay: I think the new if conditions make previousBackend necessary, please check that your feature still works fine.


Thanks,

Shantanu Tushar

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