If there are no DOCs provided at all, don't traceback, skip the _ensure_imports_below_docs test (#25621)

test/sanity/validate-modules/main.py

@@ -542,9 +542,14 @@ class ModuleValidator(Validator):
                 )
 
     def _ensure_imports_below_docs(self, doc_info, first_callable):
+        try:
             min_doc_line = min(
                 [doc_info[key]['lineno'] for key in doc_info if doc_info[key]['lineno']]
             )
+        except ValueError:
+            # We can't perform this validation, as there are no DOCs provided at all
+            return
+
         max_doc_line = max(
             [doc_info[key]['end_lineno'] for key in doc_info if doc_info[key]['end_lineno']]
         )