SL-16106 Fixed asset storage trying to request data on shutdown

indra/newview/llviewerassetstorage.cpp

@@ -520,6 +520,12 @@ void LLViewerAssetStorage::assetRequestCoro(
             boost::bind(&LLViewerAssetStorage::capsRecvForRegion, this, _1, capsRecv.getName()));
         
         llcoro::suspendUntilEventOn(capsRecv);
+
+        if (LLApp::isExiting() || !gAssetStorage)
+        {
+            return;
+        }
+
         LL_WARNS_ONCE("ViewerAsset") << "capsRecv got event" << LL_ENDL;
         LL_WARNS_ONCE("ViewerAsset") << "region " << gAgent.getRegion() << " mViewerAssetUrl " << mViewerAssetUrl << LL_ENDL;
     }