[PostGIS] #5685: ST_Node('LINESTRING(0 0, 0 0)') returns GEOMETRYCOLLECTION EMPTY

[PostGIS]

#5685: ST_Node('LINESTRING(0 0,0 0)') returns GEOMETRYCOLLECTION EMPTY
---------------------+---------------------------
 Reporter:  strk     |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  medium   |  Milestone:  PostGIS 3.5.0
Component:  postgis  |    Version:  master
 Keywords:           |
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 The GEOS counterpart of noding would return the input line untouched:
 {{{
 $ geosop node -a 'LINESTRING(0 0,0 0)'
 MULTILINESTRING ((0 0, 0 0))
 }}}

 We must be turning to EMPTY on later steps (linemerge?)
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5685>
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