check if the term is a dict so we can take a simple list of files (like first_available_file) takes

lib/ansible/runner/lookup_plugins/first_found.py

@@ -81,6 +81,7 @@ class LookupModule(object):
     def run(self, terms, **kwargs):
         result = None
         for term in terms:
+            if isinstance(term, dict):
                 files = term.get('files', [])
                 paths = term.get('paths', [])
             
@@ -108,7 +109,8 @@ class LookupModule(object):
                         for fn in filelist:
                             f = path + '/' + fn
                             total_search.append(f)
-
+            else:
+                total_search = [term]
 
             result = None
             for fn in total_search: