D9305: Change "Empty Search" to just "Search" to handle searches with no search text

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: Dolphin, elvisangelaccio.

REVISION SUMMARY
  BUG: 387854
  
  The pre-defined searches (Documents, Videos, etc) all default to no search text. https://cgit.kde.org/dolphin.git/commit/?id=702429ac8e64a5aff4e110a56f526b96ecb795fd changed their window title from "baloosearch - /" to "Empty Search", but the search isn't really empty; it just lacks a search string. It's still looking for documents, or videos, or whatever.

TEST PLAN
  Tested in KDE Neon. Before:
  
  After:

REPOSITORY
  R318 Dolphin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9305

AFFECTED FILES
  src/dolphinmainwindow.cpp

To: ngraham, #dolphin, elvisangelaccio
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