chore: only strip leading whitespace

Author: RobertCraigie

src/openai/lib/streaming/chat/_completions.py

@@ -439,7 +439,7 @@ def _accumulate_chunk(self, chunk: ChatCompletionChunk) -> ParsedChatCompletionS
                 and not choice_snapshot.message.refusal
                 and is_given(self._rich_response_format)
                 # partial parsing fails on white-space
-                and choice_snapshot.message.content.strip()
+                and choice_snapshot.message.content.lstrip()
             ):
                 choice_snapshot.message.parsed = from_json(
                     bytes(choice_snapshot.message.content, "utf-8"),