D11273: Fix QSqlQuery warnings

[Allan Sandfeld Jensen]

carewolf created this revision.
carewolf added a reviewer: mlaurent.
Restricted Application added a project: KDE PIM.
Restricted Application added a subscriber: KDE PIM.
carewolf requested review of this revision.

REVISION SUMMARY
  A default constructed QSqlQuery is not a passive null-value but a
  query prepared for the default database which may not be allowed
  in the current thread. Instead try connecting to the akonadi default
  database.
  
  BUG: 391783

REPOSITORY
  R165 Akonadi

BRANCH
  Applications/17.12

REVISION DETAIL
  https://phabricator.kde.org/D11273

AFFECTED FILES
  src/server/handler/fetchhelper.cpp
  src/server/handler/list.cpp
  src/server/storage/querybuilder.cpp

To: carewolf, mlaurent
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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