D8266: Fix QFile::copy warning when the colors file doesn't exist

[David Faure]

dfaure created this revision.
dfaure added reviewers: mart, davidedmundson.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  There is no need to even look for a "Default.colors" file when
  using the default color scheme, so skip the entire file copying
  in that case.

TEST PLAN
  Just checked that the warning went away, I didn't test
  the kde4 interaction.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  Plasma/5.11

REVISION DETAIL
  https://phabricator.kde.org/D8266

AFFECTED FILES
  kcms/krdb/krdb.cpp

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