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fitsdiff table crash

See original GitHub issue

Recently I started seeing this:

% fitsdiff  test-source.fits   test-change-row1-valueLeft.fits

 fitsdiff: 1.3.dev16465
 a: data/test-source.fits
 b: data/test-change-row1-valueLeft.fits
 Maximum number of different data values to be reported: 10
 Data comparison level: 0.0

Extension HDU 1:

   Data contains differences:
Traceback (most recent call last):
  File "/Users/jmiller/anaconda/bin/fitsdiff", line 11, in <module>
    load_entry_point('astropy==1.3.dev16465', 'console_scripts', 'fitsdiff')()
  File "/Users/jmiller/anaconda/lib/python3.5/site-packages/astropy/io/fits/scripts/fitsdiff.py", line 285, in main
    diff.report(fileobj=out_file)
  File "/Users/jmiller/anaconda/lib/python3.5/site-packages/astropy/io/fits/diff.py", line 181, in report
    self._report()
  File "/Users/jmiller/anaconda/lib/python3.5/site-packages/astropy/io/fits/diff.py", line 373, in _report
    hdu_diff.report(self._fileobj, indent=self._indent + 1)
  File "/Users/jmiller/anaconda/lib/python3.5/site-packages/astropy/io/fits/diff.py", line 181, in report
    self._report()
  File "/Users/jmiller/anaconda/lib/python3.5/site-packages/astropy/io/fits/diff.py", line 488, in _report
    self.diff_data.report(self._fileobj, indent=self._indent + 1)
  File "/Users/jmiller/anaconda/lib/python3.5/site-packages/astropy/io/fits/diff.py", line 181, in report
    self._report()
  File "/Users/jmiller/anaconda/lib/python3.5/site-packages/astropy/io/fits/diff.py", line 1189, in _report
    self._writeln(u(' Column {} data differs in row {}:').format(indx))
IndexError: tuple index out of range

The table structure should be roughly:

% finfo data/test-source.fits data/test-change-row1-valueLeft.fits
--------------------------------------------------------------------------------
Filename: data/test-source.fits
No.    Name         Type      Cards   Dimensions   Format
  0  PRIMARY     PrimaryHDU       5   ()      
  1              BinTableHDU     18   9R x 5C   [5A, 5A, I, E, 18A]   

[1]:  modeUp modeDown valueLeft valueRight wordage
--------------------------------------------------------------------------------
Filename: data/test-change-row1-valueLeft.fits
No.    Name         Type      Cards   Dimensions   Format
  0  PRIMARY     PrimaryHDU       5   ()      
  1              BinTableHDU     18   9R x 5C   [5A, 5A, I, E, 18A]   

[1]:  modeUp modeDown valueLeft valueRight wordage

Test Data:

fits_crash.zip

This data supports a unit test and is several years old. I did not construct the tables, it’s possible they’re degenerate in some way because they have a limited test-only purpose.