Nulls in Shape fields cause NPEs during geometry calculation

[jamoore]

If ellipseI.cx (for example) is null, the background work by GeomTool will constantly report NPEs.

Also should be fixed in branch!

[jmoore]

r5838 (trunk) and r5839 (b_4_!) solve this by checking for nulls in all fields, and using (0,0) as a missing value.

You can test for these special cases with the following query (the 4 objects are those for which previously there was an NPE per minute in Blitz-0.log):

4.1=# select id, discriminator, pg_geom from shape where pg_geom <@ '(0,0)'::polygon;;
  id  | discriminator | pg_geom 
------+---------------+---------
 8601 | ellipse       | ((0,0))
 8602 | ellipse       | ((0,0))
 8603 | ellipse       | ((0,0))
 8604 | ellipse       | ((0,0))
(4 rows)