MNT: do without try...except blocks

tacaswell · tacaswell · commit f5c69f6ea206 · 2017-10-10T18:55:29.000-05:00
diff --git a/lib/matplotlib/image.py b/lib/matplotlib/image.py
@@ -372,14 +372,11 @@ def _make_image(self, A, in_bbox, out_bbox, clip_bbox, magnification=1.0,
 
                 # we need these try/except blocks to handle
                 # fully-masked/invalid input
-                try:
-                    a_min = a_min.astype(scaled_dtype)
-                except AttributeError:
-                    a_min = 0
-                try:
-                    a_max = a_max.astype(scaled_dtype)
-                except AttributeError:
-                    a_min = 1
+                if np.ma.count(A) == 0:
+                    a_min, a_max = 0, 1   # all masked, so values don't matter
+                else:
+                    a_min = np.ma.min(A).astype(scaled_dtype)
+                    a_max = np.ma.max(A).astype(scaled_dtype)
                 # scale the input data to [.1, .9].  The Agg
                 # interpolators clip to [0, 1] internally, use a
                 # smaller input scale to identify which of the
