Bug report

Bug summary

I created a plot then manually created a legend to match the plot. When retrieving the handles from the legend object, get_marker() returns and empty string even when that is not the correct marker.

Code for reproduction

# Paste your code here
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Expected outcome

Expected output is 'v' rather than ''

Matplotlib version

• Operating system: mac OS X El Capitan
• Matplotlib version: 2.2.2
• Matplotlib backend (print(matplotlib.get_backend())): module://ipykernel.pylab.backend_inline
• Python version: 3.6.4
• Jupyter version (if applicable): 1.0.0
• Other libraries:

conda