fix: skip setting release if rhc_release is none

Do not set release if rhc_release is none.
See ansible-collections/community.general#6401
for details.

tasks/subscription-manager.yml

@@ -46,7 +46,8 @@
           and not 'keys' in rhc_auth.activation_keys | d({})) else omit }}"
     release: "{{ rhc_release
       if (rhc_state | d('present') != 'absent'
-           and rhc_release != __rhc_state_absent)
+           and rhc_release != __rhc_state_absent
+           and not rhc_release is none)
       else omit }}"
     server_proxy_hostname: "{% if rhc_proxy == __rhc_state_absent -%}
       {{ __rhc_empty_string }}
@@ -100,6 +101,7 @@
         - rhc_state | d("present") == "present"
         - __rhc_subman_identity.rc == 0
         - rhc_release != __rhc_state_absent
+        - not rhc_release is none
 
     - name: Unset the release
       community.general.rhsm_release: