Bug report

Bug summary

Setting the yscale to log in histogram results in empty plot

Code for reproduction

import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt

plt.figure()
plt.hist(np.random.normal(size=1000))
plt.yscale('log')
plt.show()

Actual outcome

Expected outcome

Matplotlib version

• Operating System: Archlinux
• Matplotlib Version: 2.1.0rc1+49.g20aff4baa
• Python Version: 3.6
• Jupyter Version (if applicable): notebook 5.1
• Other Libraries: