Weird padding at the bottom of matplotlib plot

[KasraF]

For the following code:

import matplotlib.pyplot as plt
import numpy as np

data = [1, 86, 42, 54, 100]

# create a bar chart
## ---
plt.bar(np.arange(len(data)), data)
## ---

There is unnecessary and distracting additional space at the bottom of the plot:

Looking at the HTML, it looks like Projection Boxes are creating a lot of empty rows in the table?

[rlisahuang]

I cannot replicate this.