Fix subquery reference to non-populated MV in CMV.

Kevin Grittner <kgrittn@postgresql.org>

Commit: be420fa02e69f084a0eeac6d2cb5424551aad495
Author: Kevin Grittner <kgrittn@postgresql.org>
Date: 2013-11-02T23:38:17Z
Releases: 9.4.0
Fix subquery reference to non-populated MV in CMV.

A subquery reference to a matview should be allowed by CREATE
MATERIALIZED VIEW WITH NO DATA, just like a direct reference is.

Per bug report from Laurent Sartran.

Backpatch to 9.3.

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