D14500: [live data] Fix crash when trying to import non-ASCII/non-Binary data

[Christoph Roick]

croick created this revision.
croick added a reviewer: LabPlot.
Restricted Application added a project: KDE Edu.
Restricted Application added a subscriber: kde-edu.
croick requested review of this revision.

REVISION SUMMARY
  Only ASCII and Binary types are available, but the file may
  be detected being another type. The file type combo box does
  not include the automatically selected type and returns -1
  for the currentIndex, which does not correspond to any file type.
  
  The patch sets a default preview table and introduces a check
  if a filter could be set.

TEST PLAN
  - try to select a HDF5, ROOT, ... file in live data selection

REPOSITORY
  R262 LabPlot

BRANCH
  liveimportselection

REVISION DETAIL
  https://phabricator.kde.org/D14500

AFFECTED FILES
  src/kdefrontend/datasources/ImportFileWidget.cpp

To: croick, #labplot
Cc: kde-edu, narvaez, apol
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