BUG-2432: Crashfix. Don't call map::erase when the iterator is not valid.

doc/contributions.txt

@@ -900,6 +900,7 @@ Nicky Dasmijn
 	VWR-29228
 	MAINT-873
 	SUN-72
+	BUG-2432
 Nicky Perian
 	OPEN-1
 	STORM-1087

indra/newview/llmeshrepository.cpp

@@ -1215,9 +1215,9 @@ bool LLMeshRepoThread::headerReceived(const LLVolumeParams& mesh_params, U8* dat
 				mLODReqQ.push(req);
 				LLMeshRepository::sLODProcessing++;
 			}
-		}
 			mPendingLOD.erase(iter);
 		}
+	}
 
 	return true;
 }