Fix typo and add flash message for when invite can't be revoked

atst/routes/applications/settings.py

@@ -386,7 +386,9 @@ def update_member(application_id, application_role_id):
     "/applications/<application_id>/members/<application_role_id>/revoke_invite",
     methods=["POST"],
 )
-@user_can(Permissions.DELETE_APPLICATION_MEMBER, message="revoke appliction invitation")
+@user_can(
+    Permissions.DELETE_APPLICATION_MEMBER, message="revoke application invitation"
+)
 def revoke_invite(application_id, application_role_id):
     app_role = ApplicationRoles.get_by_id(application_role_id)
     invite = app_role.latest_invitation
@@ -398,6 +400,12 @@ def revoke_invite(application_id, application_role_id):
             user_name=app_role.user_name,
             application_name=g.application.name,
         )
+    else:
+        flash(
+            "application_invite_error",
+            user_name=app_role.user_name,
+            application_name=g.application.name,
+        )
 
     return redirect(
         url_for(