Fixed an issue where if ACE files first angular distribution for a given incoming energy was isotropic (LC=0), then the length calculation would be incorrect since rxn%adist%location(1) was 0.
Fixed an issue where if ACE files first angular distribution for a given incoming energy was isotropic (LC=0), then the length calculation would be incorrect since rxn%adist%location(1) was 0.

bhermanmit/openmc,walshjon/openmc,shikhar413/openmc,johnnyliu27/openmc,shikhar413/openmc,mjlong/openmc,sxds/opemmc,amandalund/openmc,mit-crpg/openmc,mit-crpg/openmc,kellyrowland/openmc,samuelshaner/openmc,lilulu/openmc,liangjg/openmc,sxds/opemmc,amandalund/openmc,bhermanmit/openmc,samuelshaner/openmc,walshjon/openmc,shenqicang/openmc,wbinventor/openmc,paulromano/openmc,paulromano/openmc,smharper/openmc,shenqicang/openmc,amandalund/openmc,liangjg/openmc,wbinventor/openmc,paulromano/openmc,mjlong/openmc,paulromano/openmc,smharper/openmc,johnnyliu27/openmc,liangjg/openmc,wbinventor/openmc,kellyrowland/openmc,shikhar413/openmc,lilulu/openmc,walshjon/openmc,samuelshaner/openmc,amandalund/openmc,shikhar413/openmc,lilulu/openmc,smharper/openmc,walshjon/openmc,mit-crpg/openmc,nhorelik/openmc,smharper/openmc,wbinventor/openmc,liangjg/openmc,samuelshaner/openmc,johnnyliu27/openmc,nhorelik/openmc,mit-crpg/openmc,johnnyliu27/openmc