fix a regex for fastGN1 and fix a FPE error

Liaoshan Shi requested to merge lshi/athena:fastgn1-fix into 23.0
  • The ROI FTF step in the fastGN1 chains wasn't executed. The MR updated the regex to handle fastGN1 properly.
  • Fixed a FPE DIVBYZERO error in calculating DIPS likelihood ratio.

Tagging @tmadula @khoo @cpollard @dan-guest @lbeemste

Edited by Liaoshan Shi

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