Check for non-existant connection in prepare statement handling.

Michael Meskes <meskes@postgresql.org>

Commit: f496eb31b27856570eb62c16c00b0717fb0b63e7
Author: Michael Meskes <meskes@postgresql.org>
Date: 2008-05-12T16:30:17Z
Releases: 8.3.2
Check for non-existant connection in prepare statement handling.
Do not close files that weren't opened.

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