The class would previosuly produce a crash when the QEventLoop* or the
QThread* were nullptr or if no QCoreApplication existed. We want,
however, the out-of-line constructors of the class to be noexcept, and
for that, they should neither allocation nor have preconditions. The
former is for another patch; this patch deals with the latter.
[ChangeLog][QtCore][QEventLoopLocker] Is now a no-op on nullptr
QEventLoop*, QThread*, QCoreApplication::instance() (was: crash).
Task-number: QTBUG-114793
Pick-to: 6.6
Change-Id: I4246f74008df6ad7fcbfde56403397b065fbe861
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
3748b194d4