D25421: [kio_tags] improve log message when the database can't be opened

[Nathaniel Graham]

ngraham accepted this revision.

REPOSITORY
  R293 Baloo

REVISION DETAIL
  https://phabricator.kde.org/D25421

To: ahmadsamir, #baloo, astippich, ngraham, bruns
Cc: kde-frameworks-devel, hurikhan77, lots0logs, LeGast00n, cblack, 
fbampaloukas, GB_2, domson, ashaposhnikov, michaelh, astippich, spoorun, 
ngraham, bruns, abrahams