Rmv Diffable assert, add Remoote.url property

git/diff.py

@@ -143,8 +143,6 @@ def diff(self, other: Union[Type['Index'], 'Tree', None, str] = Index,
 
         if hasattr(self, 'Has_Repo'):
             self.repo: Repo = self.repo
-        else:
-            raise AttributeError("No repo member found, cannot create DiffIndex")
 
         diff_cmd = self.repo.git.diff
         if other is self.Index:

git/remote.py

@@ -558,6 +558,14 @@ def delete_url(self, url: str, **kwargs: Any) -> 'Remote':
         """
         return self.set_url(url, delete=True)
 
+    @property
+    def url(self) -> Union[str, List[str]]:
+        url_list = list(self.urls)
+        if len(url_list) == 1:
+            return url_list[0]
+        else:
+            return url_list
+
     @property
     def urls(self) -> Iterator[str]:
         """:return: Iterator yielding all configured URL targets on a remote as strings"""