[patch #6302] Fix bugs in GET DATA/TYPE=TXT.

[Ben Pfaff]

Update of patch #6302 (project pspp):

                  Status:   Ready For Test/Review => Done                   

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Follow-up Comment #13:

>I suggest that casereader_is_empty should take a const argument. 

I did consider this, but I decided against it because in fact it can have an
effect on the casereader, if it causes an error condition to be raised.  Now,
it is difficult to imagine a situation where this is an observable difference
to a client--since an error can occur at any time--but a const casereader
isn't good for much anyway.

I checked in all these patches, including the one that you provided (and
thanks for it).

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