Empty geometry objects in Json output

[anonymous]

What steps will reproduce the problem?

1. Save downloaded OSM data as geojson

What is the expected result?

The output should be standard conforming, that is if there is no geometry available for the Feature there should be no geometry object present.

What happens instead?

An empty geometry object is added to the geojson Feature for some (not all) OSM multipolygons.

{

"type":"Feature",
"properties":{

"landuse":"residential",
"type":"multipolygon"

},
"geometry":{
}

}

Please provide any additional information below. Attach a screenshot if possible.

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-11-06 20:18:38 +0100 (Sun, 06 Nov 2016)
Build-Date:2016-11-06 21:45:03
Revision:11223
Relative:URL: ^/trunk

Identification: JOSM/1.5 (11223 en) Windows 10 64-Bit
Memory Usage: 488 MB / 488 MB (151 MB allocated, but free)
Java version: 1.8.0_111-b14, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1920x1200, \Display1 1920x1200
Maximum Screen Size: 1920x1200
Dataset consistency test: No problems found

Plugins:
+ FastDraw (33182)
+ ImproveOsm (110)
+ Mapillary (v1.5.3)
+ OpeningHoursEditor (33185)
+ PicLayer (33148)
+ apache-commons (33668)
+ apache-http (32699)
+ cadastre-fr (33088)
+ editgpx (33004)
+ ejml (32680)
+ geotools (33380)
+ imagery_offset_db (33267)
+ jts (32699)
+ kendzi3d-resources (0.0.1)
+ log4j (32699)
+ measurement (33088)
+ opendata (33088)
+ reverter (33088)
+ terracer (33088)
+ turnrestrictions (33088)
+ undelete (33480)
+ utilsplugin2 (33328)

Tagging presets:
+ http://openstreetmap.org.pl/kendzi/preset/current/roofspresets.xml
+ http://josm.openstreetmap.de/josmfile?page=Presets/LaneAttributes&preset
+ %UserProfile%\git\wheelchair-preset\gen\wheelchair.zip
+ https://github.com/<user.name>poole/military-preset/raw/gh-pages/gen/military.zip
+ https://github.com/<user.name>poole/beautified-JOSM-preset/raw/master/gen/josm.zip
+ %UserProfile%\git\preset-utils\josm_preset.xml

Map paint styles:
- http://josm.openstreetmap.de/josmfile?page=Styles/Lane_features_ryg&style
- http://josm.openstreetmap.de/josmfile?page=Styles/Lane_features&style
+ http://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/NewHighwayColors&zip=1

Last errors/warnings:
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out
- W: GeoJSON: Failed to export multipolygon 2,171,891
- W: org.openstreetmap.josm.data.osm.MultipolygonBuilder$JoinedPolygonCreationException: Each node must connect exactly 2 ways