Fix UnboundLocalError in stream_generator - add json import

aisbf/handlers.py

@@ -491,7 +491,7 @@ class RequestHandler:
                             logger.debug(f"Chunk {chunk_idx}/{total_chunks}: delta_text='{delta_text}', delta_tool_calls={len(delta_tool_calls)}, is_last={is_last_chunk}, condition={bool(delta_text or delta_tool_calls or is_last_chunk)}")
                             
                             # Only send if there's new content, new tool calls, or it's the last chunk with finish_reason
-                            if delta_text or delta_tool_calls or is_last_chunk:
+                            if delta_tool_calls or delta_text or is_last_chunk:
                                 # Create OpenAI-compatible chunk with additional fields
                                 openai_chunk = {
                                     "id": response_id,
@@ -1533,6 +1533,7 @@ class RotationHandler:
         system_fingerprint = generate_system_fingerprint(provider_id, seed)
         
         async def stream_generator(effective_context):
+            import json
             try:
                 if is_google_provider:
                     # Handle Google's streaming response