D11912: Avoid emptry entries in project files filter list

[Friedrich W. H. Kossebau]

kossebau created this revision.
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REVISION SUMMARY
  Some project file manager plugins like KDevGenericManager do not have a list
  of project file name filters. They need to be skipped when accumulating the
  lists of file name filters instead of adding empty entries.

TEST PLAN
  Use "Open/Import Project..." action when running in environment with KDE_FULL_SESSION
  being set and select the dropdown list of the filter selection.
  No more empty entries after this patch.

REPOSITORY
  R32 KDevelop

BRANCH
  fixprojectfilefilterlist

REVISION DETAIL
  https://phabricator.kde.org/D11912

AFFECTED FILES
  kdevplatform/shell/openprojectdialog.cpp

To: kossebau, #kdevelop
Cc: kdevelop-devel
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