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

Joe Conway <mail@joeconway.com>

Commit: 0b33e2066f4400dd6d1103e62cc82e0d16b2354a
Author: Joe Conway <mail@joeconway.com>
Date: 2007-11-10T05:01:50Z
Releases: 8.1.11
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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