mrhlpr: mr: use a simpler mechanism to detect if user approved a MR

This doesn't depend on an auth error to detect if a user has approved a MR, and fixes #24 (closed).

For some reason mr.approval_state().get was 404'ing, causing #24 (closed).

mrhlpr/mr.py

@@ -550,13 +550,13 @@ def finish(
         print("Skipping approval...")
     else:
         if mr.approvals.get().attributes["user_has_approved"]:
-            print("MR had already been approved by you!")
+            print("MR has already been approved by you!")
         else:
             print("Approving MR...")
             try:
                 mr.approve(git.sha())
             except Exception as e:
-                raise RuntimeError("Approving failed, and MR not yet approved") from e
+                raise RuntimeError("Approval failed") from e
 
     if comment:
         print("Adding the comment...")