Update Chart.hx

Author: Frakits

source/funkin/backend/chart/Chart.hx

@@ -278,7 +278,7 @@ class Chart {
 
 		CoolUtil.safeSaveFile(chartPath, Json.stringify(filteredChart, null, saveSettings.prettyPrint == true ? Flags.JSON_PRETTY_PRINT : null));
 
-		if (saveSettings.overrideExistingMeta == true || !FileSystem.exists(metaPath))
+		if (meta != null && (saveSettings.overrideExistingMeta || !FileSystem.exists(metaPath)))
 			CoolUtil.safeSaveFile(metaPath, makeMetaSaveable(meta));
 		#end
 		return filteredChart;
@@ -331,4 +331,4 @@ typedef ChartSaveSettings = {
 	var ?saveGlobalEvents:Bool;
 	var ?prettyPrint:Bool;
 	var ?folder:String;
-}
+}