Ensure that unstable nuclides with no listed decay modes still decay
Ensure that unstable nuclides with no listed decay modes still decay

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