D8419: Dict Engine: improve error handling.

[David Faure]

dfaure created this revision.
dfaure added a reviewer: Plasma.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  Instead of returning "<dl>\n<dt><b></b></dt>\n<dd></dl>"
  when the word doesn't exist, return a proper readable string so users
  know that the lookup is done and nothing was found.

TEST PLAN
  I'm porting the dict applet to QtQuick, review request coming soon.

REPOSITORY
  R120 Plasma Workspace

BRANCH
  Plasma/5.11

REVISION DETAIL
  https://phabricator.kde.org/D8419

AFFECTED FILES
  dataengines/dict/CMakeLists.txt
  dataengines/dict/dictengine.cpp

To: dfaure, #plasma
Cc: plasma-devel, #plasma, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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