修复api_server方式下调用非流式接口时的bug

package/fastllm_pytools/llm.py

@@ -184,7 +184,7 @@ class model:
 
     def tokenizer_encode_string(self, content: str) -> List[int]:
         output_buffer_init_len = 1024
-        if self.thread_local_obj.tokenizer_encode_string__output_buffer is None:
+        if not hasattr(self.thread_local_obj, 'tokenizer_encode_string__output_buffer') or self.thread_local_obj.tokenizer_encode_string__output_buffer is None:
             self.thread_local_obj.tokenizer_encode_string__output_buffer = (ctypes.c_int * output_buffer_init_len)()
 
         buffer = self.thread_local_obj.tokenizer_encode_string__output_buffer
@@ -212,7 +212,7 @@ class model:
                 return cache_result
 
         output_buffer_init_len = 256
-        if self.thread_local_obj.tokenizer_decode_token__output_buffer is None:
+        if not hasattr(self.thread_local_obj, 'tokenizer_decode_token__output_buffer') or self.thread_local_obj.tokenizer_decode_token__output_buffer is None:
             self.thread_local_obj.tokenizer_decode_token__output_buffer = ctypes.create_string_buffer(output_buffer_init_len)
 
         buffer = self.thread_local_obj.tokenizer_decode_token__output_buffer