Cleaning up while loop.
Cleaning up while loop.

paulromano/openmc,liangjg/openmc,shikhar413/openmc,walshjon/openmc,liangjg/openmc,liangjg/openmc,shikhar413/openmc,mit-crpg/openmc,paulromano/openmc,walshjon/openmc,shikhar413/openmc,mit-crpg/openmc,paulromano/openmc,mit-crpg/openmc,shikhar413/openmc,smharper/openmc,amandalund/openmc,smharper/openmc,liangjg/openmc,paulromano/openmc,amandalund/openmc,smharper/openmc,amandalund/openmc,smharper/openmc,mit-crpg/openmc,amandalund/openmc,walshjon/openmc,walshjon/openmc