fix: handle missing input_json in tool call parsing

When a provider (e.g. MiniMax) sends a tool_use block without
incremental input_json_delta events, the accumulated input_json
key may not exist. Add an explicit else branch to fall back to
the input dict initialized at tool_use start instead of skipping
the else branch and having input remain as the raw {} init value
with a JSONDecodeError silently yielding empty tool args.

Author: BillionClaw

astrbot/core/provider/sources/anthropic_source.py

@@ -421,6 +421,8 @@ async def _query_stream(
                         try:
                             if "input_json" in tool_info:
                                 tool_info["input"] = json.loads(tool_info["input_json"])
+                            else:
+                                tool_info["input"] = tool_info.get("input", {})
 
                             # 添加到最终结果
                             final_tool_calls.append(
@@ -442,7 +444,7 @@ async def _query_stream(
                                 id=id,
                             )
                         except json.JSONDecodeError:
-                            # JSON 解析失败，跳过这个工具调用
+                            # JSON 解析失败，跳过这个工具调用，不 yield
                             logger.warning(f"工具调用参数 JSON 解析失败: {tool_info}")
 
                         # 清理缓冲区