opentelemetry: no_log:true causes exception when generating trace (#4043)

* dont check for urls when args is None

* add changelog fragment

* fix lint on changelog fragment

Co-authored-by: Nick Gregory <nick.gregory@openenterprise.co.uk>

changelogs/fragments/4043-fix-no-log-opentelemetry.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - "opentelemetry - fix generating a trace with a task containing ``no_log: true`` (https://github.com/ansible-collections/community.general/pull/4043)."

plugins/callback/opentelemetry.py

@@ -321,7 +321,7 @@ class OpenTelemetrySource(object):
         # the order matters
         url_args = ("url", "api_url", "baseurl", "repo", "server_url", "chart_repo_url")
         for arg in url_args:
-            if args.get(arg):
+            if args is not None and args.get(arg):
                 return args.get(arg)
         return ""