Bug report

Bug summary

Setting a logarithmic y-axis with ax.set_yscale('log') causes histograms to disappear from the axis. This occurs in 2.1.0 but not in 2.0.2.

Code for reproduction

import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt
import numpy as np

xs = np.random.normal(size=int(1e6))
fig, (ax1, ax2) = plt.subplots(1, 2)
ax1.hist(xs, range=(-5, 5), bins=100)
ax2.hist(xs, range=(-5, 5), bins=100)
ax2.set_ylim(ymin=1)
ax2.set_yscale('log')
fig.savefig('histogram.png')

Actual outcome

With 2.1.0:

Expected outcome

I expect to see a logarithm y-axis and the histogram, but I only see the former. With 2.0.2 I see this: