goto-case-dialog: Avoid gtk critical for invalid case number.
authorBen Pfaff <blp@cs.stanford.edu>
Fri, 23 Mar 2012 05:04:38 +0000 (22:04 -0700)
committerBen Pfaff <blp@cs.stanford.edu>
Tue, 26 Jun 2012 03:27:09 +0000 (20:27 -0700)
I noticed this when Go To Case was invoked with an empty data
sheet, in which case the default case number is the invalid case
number 0.


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