oci_push fails if empty remote_tags parameter

`bazel run` of `oci_push` target with an empty (`[]`) `remote_tags` parameter results in error (after succesfully pushing):
`Error: accepts 2 arg(s), received 1`

Repro with [these](https://github.com/IOrlandoni/rules_oci/commit/c6468bc2979cf255047306d96feeaf1107cf4e33) changes, visible failures on this [CI run](https://github.com/IOrlandoni/rules_oci/actions/runs/7732199977).

I can make a PR from that to get the example / test into this repo, if you wish.

Start with the oci_push entry point and the linked reproduction commit, then inspect the failures in the linked CI run. Reproduce an empty remote_tags run; done means the image pushes successfully without the argument error and an example or test covers this case.

Written by the indexing model from the issue text.