misc fixes

cmd/dkl-local-server/ws-configs.go

@@ -18,7 +18,10 @@ func wsUploadConfig(req *restful.Request, resp *restful.Response) {
 
 	if err != nil {
 		wsError(resp, err)
+		return
 	}
+
+	resp.WriteEntity(true)
 }
 
 func writeNewConfig(reader io.Reader) (err error) {
@@ -38,10 +41,17 @@ func writeNewConfig(reader io.Reader) (err error) {
 	cfgPath := configFilePath()
 	in, err := os.Open(cfgPath)
 
-	if err == nil {
+	if err != nil {
+		if os.IsNotExist(err) {
+			// nothing to backup
+		} else {
+			return // real error
+		}
+	} else {
 		err = backupCurrentConfig(in)
-	} else if !os.IsNotExist(err) {
-		return
+		if err != nil {
+			return
+		}
 	}
 
 	err = os.Rename(out.Name(), cfgPath)