modify dict include none to aviod pir dytostatic bug in while op

[xiaoguoguo626807]

PR types

Bug fixes

PR changes

Others

Description

pcard-67164
pir 下while op 要求输入和输出都是类型相同的value, 此处model_kwargs 作为while 的输入是一个dict ，dict 中包含了为none 的数据，while 无法支持，因此需要根据其是否为none 判断是否要加入dict中。 当这些参数为none时，sample 函数中不会使用到，因此不会对程序正确性产生影响

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 55.36%. Comparing base (5c57015) to head (2423220).
Report is 245 commits behind head on develop.

Files with missing lines	Patch %	Lines
...enlp/experimental/transformers/generation_utils.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8898      +/-   ##
===========================================
- Coverage    55.36%   55.36%   -0.01%     
===========================================
  Files          631      631              
  Lines        98888    98890       +2     
===========================================
- Hits         54750    54747       -3     
- Misses       44138    44143       +5     

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[vivienfanghuagood]

LGTM

[wawltor]

LGTM