Removed defaults and used spec for nested object validations

Author: Abhishek-Punhani

kolibri/plugins/learn/assets/src/views/HybridLearningLessonCard.vue

@@ -61,9 +61,9 @@
           return validateObject(content, {
             id: { type: String, required: true },
             title: { type: String, required: true },
-            thumbnail: { type: String, required: false, default: '' },
-            description: { type: String, required: false, default: '' },
-            num_coach_contents: { type: Number, required: false, default: 0 },
+            thumbnail: { type: String, required: false},
+            description: { type: String, required: false},
+            num_coach_contents: { type: Number, required: false },
           });
         },
       },

packages/kolibri/components/DownloadButton.vue

@@ -49,10 +49,11 @@
                 type: Object,
                 required: false,
                 default: () => ({}),
-                validator: function (lang) {
-                  return validateObject(lang, {
-                    lang_name: { type: String, required: true },
-                  });
+                spec: {
+                  lang_name: {
+                    type: String,
+                    required: true,
+                  },
                 },
               },
               storage_url: { type: String, required: true },