Have crosstab variants treat NULL rowid as a category in its own right,

Joe Conway <mail@joeconway.com>

Commit: f83c1a7b9743ef001e4226584e9ad83eb2709af7
Author: Joe Conway <mail@joeconway.com>
Date: 2007-11-10T05:01:20Z
Releases: 8.2.6
Have crosstab variants treat NULL rowid as a category in its own right,
per suggestion from Tom Lane. This fixes crash-bug reported by Stefan
Schwarzer.

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