Allow empty content in xml type

Peter Eisentraut <peter_e@gmx.net>

Commit: 57b1085df55d092e2a728043ec607db8fdef2483
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2014-09-09T15:34:52Z
Releases: 9.5.0
Allow empty content in xml type

The xml type previously rejected "content" that is empty or consists
only of spaces.  But the SQL/XML standard allows that, so change that.
The accepted values for XML "documents" are not changed.

Reviewed-by: Ali Akbar <the.apaan@gmail.com>

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