Fix a dev mode bug in activation distribution observer (#19004)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19004
Handling the exception case when the data has min 3.40282e+38 max -3.40282e+38
Reviewed By: jspark1105
Differential Revision: D14822193
fbshipit-source-id: b9771d1584fdf8317f5b8c7f5806be5d27314386
