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Bug report

Bug summary

• A short 1-2 sentences that succinctly describes the bug

An empty array in imshow + an extent crashes

Code for reproduction

• A minimum code snippet required to reproduce the bug, also minimizing the number of dependencies required

import matplotlib.pyplot as plt
plt.ioff()
fig, ax = plt.subplots()
im = ax.imshow([[]])
im.set_extent([-5, 5, -5, 5])
fig.canvas.draw()

Actual outcome

• The output produced by the above code, which may be a screenshot, console output, etc.

22:51 $ python /tmp/st.py 
/home/tcaswell/src/p/matplotlib/lib/matplotlib/axes/_base.py:2903: UserWarning: Attempting to set identical left==right results
in singular transformations; automatically expanding.
left=-0.5, right=-0.5
  'left=%s, right=%s') % (left, right))
/home/tcaswell/src/p/matplotlib/lib/matplotlib/image.py:327: RuntimeWarning: divide by zero encountered in double_scalars
  in_bbox.width / A.shape[1],
Floating point exception (core dumped)

Expected outcome

• A description of the expected outcome from the code snippet
  not crash

• If this used to work in an earlier version of Matplotlib, please note the version it used to work on
  1.5.3 (reportedly, not verified)

• Matplotlib version, Python version and Platform (Windows, OSX, Linux ...)
  py3.6, pyqt4, linux.

• How did you install Matplotlib and Python (pip, anaconda, from source ...)
  source 😈