fix for SH-4245: Interesting: crash in LLSpatialGroup::handleDestruction
fix for SH-4245: Interesting: crash in LLSpatialGroup::handleDestruction

gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm