calwf3 stops with no warning if it can't find a calibration file

[lprichard]

I was running calwf3 on a set of raw files called by an association table file (dark_asn.fits). calwf3 did not run which I later found was due to the fact that the CRREJTAB key word in the raw file header was a directory to the calibration file crr_for_dark.fits that was too long and was truncated. It would be really helpful that if calwf3 needs a calibration file but the path is invalid, to show this as a warning. It showed no warning in the python version calwf3 or in the calwf3.e executable from the command line

[cshanahan1]

@lprichard thanks for bringing this to our attention (apologies for the delay, no one was really maintaining this package until recently). We are working on fixing various instances of quiet errors, but for now just inspect the output and trailer files carefully. Feel free to ping me on slack with any questions as well.