[PATCH] Fix assert conditions in KOpenWithDialog

[Will Stephenson]

While looking for the cause of #164888 I found that it is possible to get 
KOpenWithDialog to assert from 'kcmshell4 filetypes' while creating a new 
service type (enter the path to an app instead of choosing an existing one) by 
cancelling the kbuildsycoca run.  This means that the following 
KService::serviceByStorageById() call returns 0, causing the assert.

The attached patch detects this case and reverts any changes to mimeapps.list 
and filetypesrc, and makes the dialog return Rejected.  It's a minor fix 
because Q_ASSERT is not fatal in release builds but it does tidy up the files.

Will
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