for-each-ref: implement missing tag values
for-each-ref: implement missing tag values

The "type" and "object" fields for tags were accepted as
valid atoms, but never implemented. Consequently, they
simply returned the empty string, even for valid tags.

Noticed by Lea Wiemann.

Signed-off-by: Jeff King <696e3fbcf235d40b6ea1ebd61c87cbea79d444e7@peff.net>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git