qa: Resolve Qt deprecation warnings - default-construct QFlags
authorManuel Nickschas <sputnick@quassel-irc.org>
Fri, 12 Mar 2021 14:23:17 +0000 (15:23 +0100)
committerManuel Nickschas <sputnick@quassel-irc.org>
Sat, 20 Mar 2021 14:55:17 +0000 (15:55 +0100)
Empty QFlags should not be created by giving a nullptr to the ctor,
but by simply using the default ctor instead.

Resolves a deprecation warning that was introduced in Qt 5.15.


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