fix(h5): 修复chooseImage和chooseVideo在extendsion为空数组时表现错误

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

@@ -33,6 +33,9 @@ export const chooseImage = {
   },
   extension: {
     type: Array,
-    default: ['*']
+    default: ['*'],
+    validator (extension, params) {
+      if (extension.length === 0) params.extension = ['*']
+    }
   }
 }

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

@@ -20,6 +20,9 @@ export const chooseVideo = {
   },
   extension: {
     type: Array,
-    default: ['*']
+    default: ['*'],
+    validator (extension, params) {
+      if (extension.length === 0) params.extension = ['*']
+    }
   }
 }