Fix beam search to sample at least 1 non eos token (#25103)
Author: yonigottesman
Pull request: yes

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Comments:
done

ok now done :) 
sorry for all the force pushes I just wasn't sure how you guys merge so I preferred to keep 1 clean commit

> sorry for all the force pushes I just wasn't sure how you guys merge so I preferred to keep 1 clean commit

@yonigottesman no worries, we squash before merging ;)

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