Add defensive file-object guard in session upload flows

Co-authored-by: Shri Sukhani <shrisukhani@users.noreply.github.com>

Author: cursoragent

hyperbrowser/client/managers/async_manager/session.py

@@ -183,6 +183,10 @@ async def upload_file(
                     original_error=exc,
                 ) from exc
         else:
+            if file_obj is None:
+                raise HyperbrowserError(
+                    "file_input must be a file path or file-like object"
+                )
             files = {"file": file_obj}
             response = await self._client.transport.post(
                 self._client._build_url(f"/session/{id}/uploads"),

hyperbrowser/client/managers/sync_manager/session.py

@@ -175,6 +175,10 @@ def upload_file(
                     original_error=exc,
                 ) from exc
         else:
+            if file_obj is None:
+                raise HyperbrowserError(
+                    "file_input must be a file path or file-like object"
+                )
             files = {"file": file_obj}
             response = self._client.transport.post(
                 self._client._build_url(f"/session/{id}/uploads"),