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[bug #59019] FITS Table crash when TFORM comes before TNULL

From: Mohammad Akhlaghi
Subject: [bug #59019] FITS Table crash when TFORM comes before TNULL
Date: Wed, 26 Aug 2020 17:25:07 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:80.0) Gecko/20100101 Firefox/80.0


                 Summary: FITS Table crash when TFORM comes before TNULL
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Wed 26 Aug 2020 10:25:05 PM BST
                Category: Table
                Severity: 3 - Normal
              Item Group: Crash
                  Status: In Progress
                 Privacy: Public
             Assigned to: makhlaghi
             Open/Closed: Open
         Discussion Lock: Any



When reading the metadata of FITS tables, to fill the blank value, we need to
know the column data type before hand. 

However, Samane Raji recently pointed me to a FITS table downloaded from the
SDSS database where TNULL (the key for the blank element) came before TFORM
(the key for the column datatype). This caused a crash in Table, not allowing
us to see the table contents. 

I am now busy adding a step to avoid this problem (and interpret such 'TNULL's
after reading all other the header keywords).


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