`TCRrep._show_incomplete()` does not work

[kamurani]

When running the TCRrep constructor, if issues are encountered with certain rows, the following message is printed:

To see entries with missing values use: tcrdist.repertoire.TCRrep._show_incomplete()

tr = TCRrep(cell_df = dff,
            organism = 'mouse',
            chains = ['alpha','beta'],
            db_file = 'alphabeta_gammadelta_db.tsv',
            compute_distances = False)
tr._show_incomplete()  # this gives AttributeError

import tcrdist 
tcrdist.repertoire.TCRrep._show_incomplete() # this also gives AttributeError

However, attempting to run this method yields AttributeError: type object 'TCRrep' has no attribute '_show_incomplete'

How is this method meant to be invoked?