Add support for Point and GeometryCollection ST_MakeValid inputs

[strk]

There's no reason to break out of a transaction only because POINT is not supported by ST_MakeValid... Just return the input point !

[pracine]

To double check but I think ST_MakeValid also fails when the geometry is empty. There's no reason to break out of a transaction only because EMPTY is not supported by ST_MakeValid...

[strk]

Can't confirm the empty case:

strk=# select ST_AsEWKT(ST_MakeValid('POLYGON EMPTY'));
   st_asewkt   
---------------
 POLYGON EMPTY
(1 row)

But GEOMETRYCOLLECTION is a problem !

trk=# select ST_AsEWKT(ST_MakeValid('GEOMETRYCOLLECTION EMPTY'));
ERROR:  ST_MakeValid: unsupported geometry type GeometryCollection

[strk]

For the GEOMETRYCOLLECTION type we actually want to _add_ the support, not just return the input

[robe]

sounds like a feature to me.

[strk]

r9554 adds acceptance of points. Note that points are just returned the way they are.

[strk]

Yep, it's a feature. Implemented in trunk with r9892.