stubtest: [minor] remove no longer necessary optional

python · JelleZijlstra · Feb 13, 2020 · Feb 6, 2020 · Feb 6, 2020 · Feb 6, 2020
commit 3162788f0702ce2561351b7ef3659484998d9cc5
diff --git a/mypy/stubtest.py b/mypy/stubtest.py
@@ -971,10 +971,7 @@ def get_typeshed_stdlib_modules(custom_typeshed_dir: Optional[str]) -> List[str]
     return sorted(modules)
 
 
-def get_whitelist_entries(whitelist_file: Optional[str]) -> Iterator[str]:
-    if not whitelist_file:
-        return
-
+def get_whitelist_entries(whitelist_file: str) -> Iterator[str]:
     def strip_comments(s: str) -> str:
         try:
             return s[: s.index("#")].strip()