Crashing with astropy 5.1

[Eric Charles]

Reading a fits file with astropy 5.1 causes this crash:

/Users/echarles/miniconda3/envs/rail_test/lib/python3.8/site-packages/astropy/table/row.py(76)eq()
-> return self.as_void() == other

This is trivially fixed by added a break statement in ioUtils.read()

        if defName in odict:
            odict = odict[defName]
            break

[Eric Charles]

fixed with #48