Deletes a track attribute.
emr_track.attr.rm(track, attr)
None.
This function deletes a track attribute.
emr_db.init_examples()
#> NULL
emr_track.attr.set("sparse_track", "test_attr", "value")
emr_track.attr.export()
#> track attr value
#> 1 sparse_track gender female
#> 2 sparse_track test_attr value
emr_track.attr.rm("sparse_track", "test_attr")
emr_track.attr.export()
#> track attr value
#> 1 sparse_track gender female