Added reasons to assertions

src/dawn/locale/LocaleManager.cpp

@@ -57,7 +57,7 @@ struct Locale LocaleManager::getLocale() {
 }
 
 std::string LocaleManager::getString(std::string key) {
-  assertNotNull(this->currentlyLoadedAsset);
+  assertNotNull(this->currentlyLoadedAsset, "LocaleManager::getString: Currently loaded asset cannot be null");
   return this->currentlyLoadedAsset->getValue(key);
 }