fixed failing matplotlylib tests from last PR

Kully · Kully · commit 73928e0079a2 · 2018-05-31T15:32:49.000-04:00
diff --git a/plotly/matplotlylib/renderer.py b/plotly/matplotlylib/renderer.py
@@ -179,11 +179,9 @@ def open_axes(self, ax, props):
 
         # let all subsequent dates be handled properly if required
 
-        try:
-            xaxis['type'] == 'date'
+        if 'type' in dir(xaxis) and xaxis['type'] == 'date':
             self.x_is_mpl_date = True
-        except KeyError:
-            pass
+
 
     def close_axes(self, ax):
         """Close the axes object and clean up.
