[Bugfix] 修改创建label时报错的bug

apps/assets/models/label.py

@@ -29,6 +29,10 @@ class Label(models.Model):
         for name in names:
             yield name, cls.objects.filter(name=name)
 
+    @property
+    def asset_count(self):
+        return self.assets.count()
+
     def __str__(self):
         return "{}:{}".format(self.name, self.value)