Changed "input_ivar != None" to "input_ivar is not None" to avoid numpy warning that future versions will do element-wise comparison.
Changed "input_ivar != None" to "input_ivar is not None" to avoid
numpy warning that future versions will do element-wise comparison.

desihub/desispec,gdhungana/desispec,profxj/desispec,timahutchinson/desispec,timahutchinson/desispec,gdhungana/desispec,profxj/desispec,desihub/desispec