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

Joe Conway <mail@joeconway.com>

Commit: 96365c7197007e68f95ef3e9d5f034366e0afc76
Author: Joe Conway <mail@joeconway.com>
Date: 2007-11-10T05:02:04Z
Releases: 8.0.15
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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