Fix dataset with empty char.

[ZHUI]

PR types

Others

PR changes

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Description

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[paddle-bot[bot]]

Thanks for your contribution!

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 54.42%. Comparing base (7f13396) to head (9e6f12b). Report is 294 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8469      +/-   ##
===========================================
+ Coverage    54.29%   54.42%   +0.13%     
===========================================
  Files          617      632      +15     
  Lines        96325    99451    +3126     
===========================================
+ Hits         52297    54129    +1832     
- Misses       44028    45322    +1294     

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[EnflameGCU]

fix [PaddleNLP-gpt-A100] CI API报错： https://github.com/PaddlePaddle/PaddleNLP/pull/8470/files