Check if role has description before editing

Author: jdavcs

lib/galaxy/managers/users.py

@@ -241,11 +241,13 @@ def purge(self, user, flush=True):
         for role in user.all_roles():
             if self.app.config.redact_username_during_deletion:
                 role.name = role.name.replace(user.username, uname_hash)
-                role.description = role.description.replace(user.username, uname_hash)
+                if role.description:
+                    role.description = role.description.replace(user.username, uname_hash)
 
             if self.app.config.redact_email_during_deletion:
                 role.name = role.name.replace(user.email, email_hash)
-                role.description = role.description.replace(user.email, email_hash)
+                if role.description:
+                    role.description = role.description.replace(user.email, email_hash)
             self.session().add(role)
         private_role.name = email_hash
         private_role.description = f"Private Role for {email_hash}"