[FIX] core: also consider materialized views as existing

At the end of registry loading, a check is made on every model to
verify its table exists in the database. Materialized views weren't
considered during this check.

Note that we can't use `information_schema` views in this case because
it does include materialized views on purpose [1].

Forward-port of 4ca6945256f9353ab7f9633552872fd1fa7fdaca

[1] http://www.postgresql-archive.org/Materialized-views-don-t-show-up-in-information-schema-tp5822643p5822644.html

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