[Bug fix]: replace NaN with maximum penalized scores

[vpchung]

Changelog

• If lesionwise Dice score cannot be computed, give a default penalty score of 0
• Similar to Dice, give a default penalty score of 374 if lesionwise HD95 cannot be computed

[vpchung]

@rachitsaluja what do you think about using the penalty scores here instead of NaN?

[vpchung]

Closing, as this does not address all edge cases.