ldap: Remove some unnecessary indentation.

We created this redundant pair of conditionals in a preceding commit,
in order to match the indentation of an `except` block so as to slice
the diffs extra finely as we're refactoring auth code.

zproject/backends.py

@@ -484,7 +484,6 @@ class ZulipLDAPAuthBackend(ZulipLDAPAuthBackendBase):
         if user_profile is not None:
             return user_profile, False
 
-        if user_profile is None:
         if self._realm is None:
             raise ZulipLDAPConfigurationError("Realm is None", self.REALM_IS_NONE_ERROR)
         # No need to check for an inactive user since they don't exist yet