Add assertion/check for NIL key in plNetResManager::IKeyUnreffed()

MOULOpenSourceClientPlugin/Plasma20/Sources/Plasma/PubUtilLib/plNetCommon/plNetResManager.cpp

@@ -98,5 +98,13 @@ void plNetResManager::IKeyReffed(plKeyImp* key)
 
 void plNetResManager::IKeyUnreffed(plKeyImp* key)
 {
-	delete key; 
+//   Expanded even with HS_DEBUGGING undefined. XXX
+//	hsAssert( key != nil, "NetResMgr::NIL key to Unref" );
+	if (key == nil) {
+		ErrorAssert(104,
+					"H:\\projects\\OpenURU\\Repo\\Foundry-CWE-ou-minkata\\MOULOpenSourceClientPlugin\\Plasma20\\Sources\\Plasma\\PubUtilLib\\plNetCommon\\plNetResManager.cpp",
+					"NetResMgr::NIL key to Unref");
+	} else {
+		delete key;
+	}
 }