caminfo - no warning/failure for images with missing original label

[lwellerastro]

ISIS version(s) affected: 5.0.2

Description
caminfo does not throw a warning or error message when originallabel=true and the image has no original label information.

How to reproduce
See data under /work/users/lweller/Isis3Tests/Caminfo/OrigLabel/

caminfo from=HI395_0000_ND2.lev0.cub originallabel=true geometry=true to=info.pvl

The output file only contains the geometry information for the image but no original label information.

This image produces an error when catoriglab is run on it

catoriglab from=HI395_0000_ND2.lev0.cub to=lab.pvl
  Group = Error
    Program = catoriglab
    Class   = "USER ERROR"
    Code    = 2
    Message = "Could not find OriginalLabel or OriginalXmlLabel in input file
               [HI395_0000_ND2.lev0.cub]"
    File    = main.cpp
    Line    = 81

I think a warning at the very least is appropriate.

Additional context
This problem was encountered while working with Phobos data and was discovered while trouble-shooting post #4816