fail when bot user has no emails defined

Summary

When bot user has no emails defined, the role cannot update it.

Steps to reproduce

1. Remove emails from bot user
2. Run ./execute ENVIRONMENT deploy --tags rocketchat

Expected behavior

everything up and running

Actual behavior

Failure on step "update bot user"

Relevant logs and/or screenshots

fatal: [rocketchat]: FAILED! => {"failed": true, "msg": "The conditional check '_rocketchat_bot_user_from_list.name != rocketchat_bot_display_name or  rocketchat_bot_mail not in _rocketchat_bot_user_from_list | json_query('emails[*].address') or _result_rocketchat_bot_login.status == 401' failed. The error was: Unexpected templating type error occurred on ({% if _rocketchat_bot_user_from_list.name != rocketchat_bot_display_name or  rocketchat_bot_mail not in _rocketchat_bot_user_from_list | json_query('emails[*].address') or _result_rocketchat_bot_login.status == 401 %} True {% else %} False {% endif %}): argument of type 'NoneType' is not iterable\n\nThe error appears to have been in '/home/bdaca/Praca/ansible-playbooks/teamworm-temp/roles/rocketchat/tasks/deploy.yml': line 111, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n    - name: \"update bot user\"\n      ^ here\n"}

Possible fixes

we have to test if the list is not empty