Fix `GDScriptCache::get_full_script` eating parsing errors because of early exit

Fixes #75545.

modules/gdscript/gdscript_cache.cpp

@@ -287,7 +287,8 @@ Ref<GDScript> GDScriptCache::get_full_script(const String &p_path, Error &r_erro
 
 	if (script.is_null()) {
 		script = get_shallow_script(p_path, r_error);
-		if (r_error) {
+		// Only exit early if script failed to load, otherwise let reload report errors.
+		if (script.is_null()) {
 			return script;
 		}
 	}