Ignore None when converting data

dstansby · dstansby · commit 0462d2e3ee0b · 2018-04-18T15:18:40.000+01:00
diff --git a/lib/matplotlib/units.py b/lib/matplotlib/units.py
@@ -78,6 +78,8 @@ def wrapper(*args, **kwargs):
 
             # Helper method to process unit info, and convert *original_data*
             def _process_info(original_data, axis):
+                if original_data is None:
+                    return
                 if axis == 'x':
                     axes._process_unit_info(xdata=original_data, kwargs=kwargs)
                     converted_data = axes.convert_xunits(original_data)
