Handle unexpectedly-null instance-attributes
Handle unexpectedly-null instance-attributes

   Shouldn't happen in production, but need to ensure that
   if instances don't have attached root disks or ENIs that
   we don't vomit when the data's missing.

   Probably need to simply skip any instances that are
   missing root EBSes (and/or ENIs) since they, presumably,
   weren't in a state worth saving?

marioncobretti/MothBall