Pareto Plot Warning

[driscoll42]

Describe the bug
When running the ebay_seller_plot, in the paretoplot part of the code it'll give warnings in the output:

plotting.py:566: UserWarning: FixedFormatter should only be used together with FixedLocator
ax2.set_yticklabels(['{:,.2%}'.format(x) for x in vals])
No handles with labels found to put in legend.
plotting.py:566: UserWarning: FixedFormatter should only be used together with FixedLocator
ax2.set_yticklabels(['{:,.2%}'.format(x) for x in vals])
No handles with labels found to put in legend.

It doesn't seem to hurt the graph output at all.

Expected behavior
It'd be good to fix whatever is causing this to reduce possible confusion.

[driscoll42]

matplotlib/matplotlib#18848

https://stackoverflow.com/questions/63723514/userwarning-fixedformatter-should-only-be-used-together-with-fixedlocator