D27216: [KProcessRunner] Improve error messages on failure

[David Faure]

dfaure added reviewers: davidedmundson, broulik.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D27216

To: ahmadsamir, #frameworks, dfaure, davidedmundson, broulik
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns
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