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Print a clear warning when indentation sample is missing

Igor Kushnir requested to merge igorkushnir/kdevelop:add-missing-indentation-sample-warning into master

Currently KDevelop does some useless work, then prints an unrelated and confusing warning: "indent returned empty text for style ..."

Steps to make KDevelop print this warning:

  1. Check "Override Kate Indentation Mode" and/or "Add Kate Modeline" checkbox in Source Formatter configuration.
  2. Configure any Custom Script Formatter style for a language, e.g. C++.
  3. Open a document in the configured language, e.g. a .cpp file.
  4. Ensure that no text is selected, then trigger Reformat Source action.

Note that !273 (merged) implements ClangSupport::indentationSample(). But other language plugins don't override this function. Once !273 (merged) is merged, this message will still be printed for Python documents.

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