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

Joe Conway <mail@joeconway.com>

Commit: 75ffb44e7f57e4a993e387c9727b2e9c9d08269d
Author: Joe Conway <mail@joeconway.com>
Date: 2007-11-10T05:02:41Z
Releases: 7.3.21
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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