add default return in switch-case

src/content/ContentPack.hpp

@@ -79,6 +79,7 @@ struct ContentPack {
             case ContentType::ENTITY: return ContentPack::ENTITIES_FOLDER;
             case ContentType::GENERATOR: return ContentPack::GENERATORS_FOLDER;
             case ContentType::NONE: return fs::u8path("");
+            default: return fs::u8path("");
         }
     }
 };