galaxy: fix AttributeError on empty requirements.yml (#66726)

* galaxy: fix AttributeError on empty requirements.yml

* add changelog

changelogs/fragments/66726-galaxy-fix-attribute-error.yml

@@ -0,0 +1,2 @@
+bugfixes:
+    - galaxy - Fix an AttributeError on ansible-galaxy install with an empty requirements.yml (https://github.com/ansible/ansible/issues/66725).

lib/ansible/cli/galaxy.py

@@ -428,7 +428,7 @@ class GalaxyCLI(CLI):
                     "Failed to parse the requirements yml at '%s' with the following error:\n%s"
                     % (to_native(requirements_file), to_native(err)))
 
-        if requirements_file is None:
+        if file_requirements is None:
             raise AnsibleError("No requirements found in file '%s'" % to_native(requirements_file))
 
         def parse_role_req(requirement):