D8140: Always create Documentation tool view, fix it to work with no providers

[Friedrich W. H. Kossebau]

kossebau edited the summary of this revision.

REPOSITORY
  R32 KDevelop

BRANCH
  fixdoctoolviewnotshownwithjustqtdocs

REVISION DETAIL
  https://phabricator.kde.org/D8140

To: kossebau, #kdevelop, apol
Cc: kdevelop-devel
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