最新的swift4.0.2镜像，Qwen3.5-35B-A3B模型gptq量化报错

Checklist / 检查清单

• I have searched existing issues, and this is a new bug report. / 我已经搜索过现有的 issues，确认这是一个新的 bug report。

Bug Description / Bug 描述

Traceback (most recent call last):
File "/usr/local/lib/python3.11/site-packages/swift/cli/export.py", line 5, in
export_main()
File "/usr/local/lib/python3.11/site-packages/swift/pipelines/export/export.py", line 54, in export_main
return SwiftExport(args).main()
^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/swift/pipelines/base.py", line 52, in main
result = self.run()
^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/swift/pipelines/export/export.py", line 31, in run
quantize_model(args)
File "/usr/local/lib/python3.11/site-packages/swift/pipelines/export/quant.py", line 290, in quantize_model
QuantEngine(args).quantize()
File "/usr/local/lib/python3.11/site-packages/swift/pipelines/export/quant.py", line 47, in quantize
gptq_quantizer = self.gptq_model_quantize(v2=(args.quant_method == 'gptq_v2'))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/swift/pipelines/export/quant.py", line 267, in gptq_model_quantize
modules_in_block_to_quantize = self.get_modules_in_block_to_quantize(self.model, block_name_to_quantize)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/swift/pipelines/export/quant.py", line 221, in get_modules_in_block_to_quantize
prefix, experts = QuantEngine._get_experts(block)
^^^^^^^^^^^^^^^
TypeError: cannot unpack non-iterable NoneType object

How to Reproduce / 如何复现

swift4.0.2镜像

Additional Information / 补充信息

No response

Start with swift/pipelines/export/quant.py, especially QuantEngine._get_experts and get_modules_in_block_to_quantize around the reported traceback. Reproduce using the swift4.0.2 image and the Qwen3.5-35B-A3B GPTQ export described in the issue. Done means the export no longer raises the NoneType unpacking error and completes quantization.