D18309: don't set python exe to undefined

[Harald Sitter]

sitter created this revision.
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REVISION SUMMARY
  FindPythonInterp sets PYTHON_EXECUTABLE, we overrode it by setting an
  empty var. add a comment to explain the unbalancedness of the conditional
  branches.

REPOSITORY
  R98 Breeze for Gtk

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18309

AFFECTED FILES
  cmake/FindPythonCairo.cmake

To: sitter
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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