oddity with ALTER ROLE/USER

I noticed that ALTER ROLE/USER succeeds even when called without any
options:

postgres=# alter user foo;
ALTER ROLE
postgres=# alter role foo;
ALTER ROLE
postgres=# alter group foo;
ERROR:  syntax error at or near ";"
LINE 1: alter group foo;

That seems odd, does nothing useful, and is inconsistent with, for
example, ALTER GROUP as shown above.

Proposed patch attached.

Comments/thoughts?

Joe

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