[py]: Fix issue with LocalFileDetector returning the path for files that do not exist

Author: symonk

py/selenium/webdriver/remote/file_detector.py

@@ -46,6 +46,7 @@ class LocalFileDetector(FileDetector):
 
     def is_local_file(self, *keys: AnyKey) -> Optional[str]:
         file_path = "".join(keys_to_typing(keys))
+
         with suppress(OSError):
-            _ = Path(file_path).is_file()
-            return file_path
+            if Path(file_path).is_file():
+                return file_path