feat：Avatar组件在接收到空的faceUrl时自动使用指定的默认图片地址

lib/ui/widgets/avatar.dart

@@ -62,7 +62,7 @@ class Avatar extends TIMUIKitStatelessWidget {
     }
 
     // final emptyAvatarBuilder = coreService.emptyAvatarBuilder;
-    if (faceUrl != "") {
+    if (faceUrl != "" && faceUrl.isNotEmpty) {
       if (isFromLocalAsset) {
         return Image.asset(
           faceUrl,
@@ -74,11 +74,27 @@ class Avatar extends TIMUIKitStatelessWidget {
         fadeInDuration: const Duration(milliseconds: 0),
         fit: BoxFit.cover,
         errorWidget: (BuildContext context, String c, dynamic s) {
-          return defaultAvatar();
+          return CachedNetworkImage(
+            imageUrl:
+                'https://quanxue-oa.oss-cn-chengdu.aliyuncs.com/avatar.png',
+            fadeInDuration: const Duration(milliseconds: 0),
+            fit: BoxFit.cover,
+            errorWidget: (BuildContext context, String c, dynamic s) {
+              return defaultAvatar();
+            },
+          );
         },
       );
     } else {
-      return defaultAvatar();
+      // return defaultAvatar();
+      return CachedNetworkImage(
+        imageUrl: 'https://quanxue-oa.oss-cn-chengdu.aliyuncs.com/avatar.png',
+        fadeInDuration: const Duration(milliseconds: 0),
+        fit: BoxFit.cover,
+        errorWidget: (BuildContext context, String c, dynamic s) {
+          return defaultAvatar();
+        },
+      );
     }
   }
 
@@ -111,7 +127,7 @@ class Avatar extends TIMUIKitStatelessWidget {
       }
     }
 
-    if (faceUrl != "") {
+    if (faceUrl != "" && faceUrl.isNotEmpty) {
       if (isFromLocalAsset) {
         return Image.asset(faceUrl).image;
       }
@@ -119,7 +135,9 @@ class Avatar extends TIMUIKitStatelessWidget {
         faceUrl,
       );
     } else {
-      return defaultAvatar();
+      return CachedNetworkImageProvider(
+        'https://quanxue-oa.oss-cn-chengdu.aliyuncs.com/avatar.png',
+      );
     }
   }