fixed usermedian shape logic (again)

Author: phobson

lib/matplotlib/axes/_axes.py

@@ -2945,7 +2945,7 @@ def boxplot(self, x, notch=False, sym='b+', vert=True, whis=1.5,
 
         # replace medians if necessary:
         if usermedians is not None:
-            if (len(np.ravel(usermedians)) != len(bxpstats) and
+            if (len(np.ravel(usermedians)) != len(bxpstats) or
                 np.shape(usermedians)[0] != len(bxpstats)):
                 medmsg = 'usermedians length not compatible with x'
                 raise ValueError(medmsg)