D20514: [Information Panel] Remove nullptr checks for MetaDataWidget member

[Elvis Angelaccio]

elvisangelaccio accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R318 Dolphin

BRANCH
  cleanup

REVISION DETAIL
  https://phabricator.kde.org/D20514

To: bruns, #dolphin, elvisangelaccio
Cc: kfm-devel, alexde, feverfew, meven, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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