[PR #4964/e2426707 backport][stable-5] Fix keyring_info when using keyring library

[patchback]

This is a backport of PR #4964 as merged into main (e242670).

SUMMARY

The docs say this module works with the keyring library, but actually this line was clobbering any passphrase retrieved from that library, making it useless on any system without the alternate method (gnome-keyring).

After this change, it'll only use the alternate method if the first one didn't work, so the return value from the first one will actually get passed through.

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

keyring_info

ADDITIONAL INFORMATION

Reproduction:

# tested on macOS

- name: Save a password to the keychain
  community.general.keyring:
    service: example-service
    username: example-user
    password: example-password
    keyring_password: ""

- name: Read it back from the keychain
  community.general.keyring_info:
    service: example-service
    username: example-user
    keyring_password: ""
  register: example_result

- debug:
    msg: "{{ example_result }}"

before the change

ok: [localhost] => 
    msg:
        changed: false
        failed: false
        msg: Password for example-service@example-user does not exist.

after the change

ok: [localhost] => 
    msg:
        changed: false
        failed: false
        msg: Successfully retrieved password for example-service@example-user
        passphrase: example-password

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