Don't warn about nodes with note=* tag only

[Klumbumbus]

There is nothing wrong with such a node. It is used to give other mappers hints, e.g. about outdated aerial imageries or other things which seem wrong/missing in the osm data but are not in fact.

[skyper]

Usually, I use a life cycle prefix and do not delete all other tags in these cases. Only a note without any other tag is more like a FIXME, in my eyes, but data might proof the opposite.

[Klumbumbus]

There is not always an osm object to which the note or lifecycle prefixes can be added, e.g.

• ​https://www.openstreetmap.org/node/7198194348 (looks like bridge on aerial image)
• ​https://www.openstreetmap.org/node/2951433502 (looks like connection on aerial image)
• ​https://www.openstreetmap.org/node/3878290563 (this one is obsolete meanwhile, but is was not back in the days when bing was the default background which had >50m offset there.)

Or for bulding outlines which slighty changed due to construction work you usually don't keep the old outline but just change the building outline. To prevent other mappers to "fix" the outline based on (outdated) aerial image, a note on a node is useful. On the building way it can easily be overseen.