[PostGIS] #6028: Mis-shapen Empty Polygon Crashes Backend

[PostGIS]

#6028: Mis-shapen Empty Polygon Crashes Backend
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 Reporter:  pramsey  |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  blocker  |  Milestone:
Component:  postgis  |    Version:  3.2.x
 Keywords:           |
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 From the mailing list
 {{{
 drop table if exists fault;
 create table fault (fid integer, geom geometry(Polygon,5015));
 CREATE INDEX fault_geom_index ON fault USING GIST (geom);
 INSERT INTO fault (fid, geom) VALUES (1,
 '0103000020971300000100000000000000'::GEOMETRY);
 }}
 The polygon in the WKB is a polygon with one ring, which has zero points.
 This is legal WKB, but not really distinct from an empty polygon
 represented with zero rings, from a spatial logic point of view. It still
 covers no space and is a polygon.

 When parsing this input WKB, it makes sense to just convert the input into
 a standard empty polygon.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6028>
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