bugfix: When src is empty, the loading state is wrong.

fixed #910

Author: BeiQiaoT

uni_modules/uview-ui/components/u-image/u-image.vue

@@ -117,7 +117,7 @@ export default {
 				if (!n) {
 					// 如果传入null或者''，或者false，或者undefined，标记为错误状态
 					this.isError = true
-
+					this.loading = false;
 				} else {
 					this.isError = false;
 					this.loading = true;