The document said:
tag <tag-command> [tag] [note]
<tag-command> can be “add”, “remove” or “list” to assign or remove [tag]
from [note], or to list the notes associated with [tag].
So if I use a tag command without a note name
joplin tag remove tag_name
Joplin terminal would report error of:
Cannot find “undefined”.
The desktop version is OK with this feature.