Bar fix

[nicolaskruchten]

This is needed so we can pass in column names as e.g. bool or Timestamp, which anyway fail in the else branch. The Pandas visualization docs have this example, which doesn't run without this fix and does with it:

import pandas as pd
import numpy as np
pd.options.plotting.backend="plotly"
ts = pd.Series(np.random.randn(1000), index=pd.date_range('1/1/2000', periods=1000))
df = pd.DataFrame(np.random.randn(1000, 4), index=ts.index, columns=list('ABCD'))
df.iloc[5].plot.bar()

[emmanuelle]

💃 when all green! Thanks!