update: chooseFile、chooseImage、chooseVideo的extension为空时报错与微信一致

src/core/helpers/protocol/media/choose-file.js

@@ -32,6 +32,9 @@ export const chooseFile = {
   },
   extension: {
     type: Array,
-    default: ['']
+    default: [''],
+    validator (extension, params) {
+      if (extension.length === 0) { return 'param extension should not be empty.' }
+    }
   }
 }

src/core/helpers/protocol/media/choose-image.js

@@ -35,7 +35,7 @@ export const chooseImage = {
     type: Array,
     default: ['*'],
     validator (extension, params) {
-      if (extension.length === 0) params.extension = ['*']
+      if (extension.length === 0) { return 'param extension should not be empty.' }
     }
   }
 }

src/core/helpers/protocol/media/choose-video.js

@@ -22,7 +22,7 @@ export const chooseVideo = {
     type: Array,
     default: ['*'],
     validator (extension, params) {
-      if (extension.length === 0) params.extension = ['*']
+      if (extension.length === 0) { return 'param extension should not be empty.' }
     }
   }
 }