ansible-doc don't show empty paths (#85294)

If no path is given, it can only mean that it is a Jinja plugin, display Jinja as 'provider' then.

(cherry picked from commit 8ec403a3b9)

lib/ansible/cli/doc.py

@@ -1440,7 +1440,7 @@ class DocCLI(CLI, RoleMixin):
         pad = display.columns * 0.20
         limit = max(display.columns - int(pad), 70)
 
-        text.append("> %s %s (%s)" % (plugin_type.upper(), _format(doc.pop('plugin_name'), 'bold'), doc.pop('filename')))
+        text.append("> %s %s (%s)" % (plugin_type.upper(), _format(doc.pop('plugin_name'), 'bold'), doc.pop('filename') or 'Jinja2'))
 
         if isinstance(doc['description'], list):
             descs = doc.pop('description')

test/integration/targets/ansible-doc/runme.sh

@@ -287,3 +287,6 @@ echo "test 'sidecar' for no extension module  with .py doc"
 
 echo "test 'sidecar' for no extension module  with .yml doc"
 [ "$(ansible-doc -M ./library -l ansible.legacy |grep -v 'UNDOCUMENTED' |grep -c facts_one)" == "1" ]
+
+echo "Test j2 plugins get jinja2 instead of path"
+ansible-doc -t filter map 2>&1 |grep "${GREP_OPTS[@]}" '(Jinja2)'