D5681: avoid crash when reading from connection times out

[Martin Koller]

mkoller created this revision.
Restricted Application added a project: KDE PIM.
Restricted Application added a subscriber: KDE PIM.

REVISION SUMMARY
  DataStream::waitForData() can time out. When this happens, Protocol::deserialize() throws an exception and the returned pointer
  is nullptr, wich is not checked for in the connection.
  I had exactly this crash, therefore I found it.

REPOSITORY
  R165 Akonadi

REVISION DETAIL
  https://phabricator.kde.org/D5681

AFFECTED FILES
  src/core/connection.cpp

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