chore: update showModal

src/platforms/app-plus/service/api/ui/popup.js

@@ -128,13 +128,14 @@ export function hideToast () {
 }
 export function showModal ({
   title = '',
-  content = ' ',
+  content = '',
   showCancel = true,
   cancelText = '取消',
   cancelColor = '#000000',
   confirmText = '确定',
   confirmColor = '#3CC51F'
-} = {}, callbackId) {
+} = {}, callbackId) {
+  content = content || ' '
   plus.nativeUI.confirm(content, (e) => {
     if (showCancel) {
       invoke(callbackId, {