D19108: [ExternalExtractor] Provide more helpful output when extractor fails

[Stefan Brüns]

bruns created this revision.
bruns added reviewers: Baloo, Frameworks, ngraham, poboiko, astippich.
Herald added projects: Frameworks, Baloo.
Herald added a subscriber: kde-frameworks-devel.
bruns requested review of this revision.

REVISION SUMMARY
  In case the executable fails to start, no error was given at all.
  Show the pluginpath if no manifest.json is found.
  Show the extractor path and indexed file when the extractor fails at
  runtime.

TEST PLAN
  ctest

REPOSITORY
  R286 KFileMetaData

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D19108

AFFECTED FILES
  src/externalextractor.cpp

To: bruns, #baloo, #frameworks, ngraham, poboiko, astippich
Cc: kde-frameworks-devel, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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