[orca] Work around Gecko not pruning alt="" images from accessibility tree

[Joanmarie Diggs <joanied src gnome org>]

commit 1581456acc924635703d55d1cac4b6fe3150f46b
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Tue Jun 6 18:44:55 2017 -0400

    Work around Gecko not pruning alt="" images from accessibility tree

 src/orca/scripts/web/script_utilities.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/orca/scripts/web/script_utilities.py b/src/orca/scripts/web/script_utilities.py
index e84d7fb..70d5b50 100644
--- a/src/orca/scripts/web/script_utilities.py
+++ b/src/orca/scripts/web/script_utilities.py
@@ -2545,7 +2545,7 @@ class Utilities(script_utilities.Utilities):
             image = obj.queryImage()
             if image.imageDescription:
                 rv = False
-            else:
+            elif not self.hasExplicitName(obj):
                 width, height = image.getImageSize()
                 if width > 25 and height > 25:
                     rv = False