MAINT-813 FIXED Potential fix for a crash at LLViewerRegion::getPosGlobalFromRegion.
MAINT-813 FIXED Potential fix for a crash at LLViewerRegion::getPosGlobalFromRegion.

As far as I can tell, if login fails with the "Region has begun the logout process" message, gAgentAvatarp gets destroyed, which leads to the crash.
Adding a check that should prevent it (could not reproduce to make sure).

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