Must not remove empty nodes outside the downloaded area

[naoliv]

Validate the attached example file and note one No tags - Unconnected nodes without physical tags warning.
Also note that if offers to fix (remove) it.

This shouldn't happen when the node is outside the downloaded area. It's common to see unconnected nodes specially when we are reverting some changesets with deleted nodes.

Removing them usually cause conflicts and broken data.

JOSM:

Build-Date:2016-01-23 20:16:25
Revision:9593
Is-Local-Build:true

Identification: JOSM/1.5 (9593 SVN en) Linux Debian GNU/Linux unstable (sid)
Memory Usage: 659 MB / 3641 MB (341 MB allocated, but free)
Java version: 1.8.0_72-internal-b15, Oracle Corporation, OpenJDK 64-Bit Server VM
VM arguments: [-Dawt.useSystemAAFontSettings=on]
Dataset consistency test: No problems found

Plugins:
- AddrInterpolation (31772)
- Create_grid_of_ways (31772)
- FastDraw (31895)
- FixAddresses (31772)
- OpeningHoursEditor (31772)
- PicLayer (31895)
- SimplifyArea (31895)
- apache-commons (31895)
- buildings_tools (31895)
- download_along (31772)
- editgpx (31772)
- ejml (31895)
- geotools (31895)
- graphview (31895)
- jts (31772)
- log4j (31895)
- measurement (31895)
- merge-overlap (31967)
- opendata (31937)
- pdfimport (31895)
- photo_geotagging (31895)
- poly (31772)
- reverter (32005)
- tagging-preset-tester (31895)
- todo (29154)
- turnrestrictions (31895)
- undelete (31895)
- utilsplugin2 (31895)

[Don-vip]

In 9604/josm:

fix #12436 - untagged node validator test: do not remove empty nodes outside the downloaded area