Fracture: Hide "New Fracture" in context menu when no Fracture Template is defined

[hhgs]

This to avoid user confusion and possible crash if used wo/template available.

"New Fracture" added to "Simulation well" wo/template:
Qt has caught an exception thrown from an event handler. Throwing exceptions from an event handler is not supported in Qt. You must reimplement QApplication::notify() and catch all exceptions there.

terminate called after throwing an instance of 'std::domain_error' what(): Result Column Identifier Ouf of Bounds /project/res/x86_64_RH_6/bin/resinsightdaily: line 21: 15959 Aborted (core dumped) $COMMAND $@

[magnesj]

Close when integrated into dev