"UnboundLocalError: local variable 'ax2' referenced before assignment" on msno.bar(df)

[paulochf]

Hello!

Just tried to run a msno.bar(df), but it returned the following

---------------------------------------------------------------------------
UnboundLocalError                         Traceback (most recent call last)
<command-823280> in <module>()
----> 1 msno.bar(df)

/databricks/python/lib/python3.5/site-packages/missingno/missingno.py in bar(df, figsize, fontsize, labels, log, color, inline, filter, n, p, sort)
    245     ax3.grid(False)
    246 
--> 247     for ax in [ax1, ax2, ax3]:
    248         ax.spines['top'].set_visible(False)
    249         ax.spines['right'].set_visible(False)

UnboundLocalError: local variable 'ax2' referenced before assignment

[ResidentMario]

Fixed in 0.4.1, pip install -u missingno to get it.