[PostGIS] #5923: CG_ExtrudeStraightSkeleton crashes with polygon empty

[PostGIS]

#5923: CG_ExtrudeStraightSkeleton crashes with polygon empty
---------------------+-----------------------------
 Reporter:  robe     |      Owner:  Loïc Bartoletti
     Type:  defect   |     Status:  new
 Priority:  blocker  |  Milestone:  PostGIS SFCGAL
Component:  sfcgal   |    Version:  3.5.x
 Keywords:           |
---------------------+-----------------------------
 {{{
 SELECT CG_ExtrudeStraightSkeleton(ST_GeomFromText('POLYGON EMPTY',4326),
 20.1, 20.1)
 }}}

 I tested on my install -


 {{{
 POSTGIS="3.6.0dev 3.5.0-373-g51b525ac5" [EXTENSION] PGSQL="180" GEOS="3.14
 .0dev-CAPI-1.20.0" SFCGAL="SFCGAL 2.1.0, CGAL 6.0.1, BOOST 1.88.0"
 }}}


 I also turned on garden testing on GHA and it crashes there, I think that
 is more or less 2.1.0 or master branch

 https://github.com/robe2/postgis/actions/runs/15480665967/job/43585783915#step:4:1451
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5923>
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