[orca] Defer to super class's queryNonEmptyText() when browse mode is sticky

[Joanmarie Diggs <joanied src gnome org>]

commit b057c99efcb716fd34ebcdb92f5e0376bf2e2138
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Thu Feb 2 12:41:20 2017 +0100

    Defer to super class's queryNonEmptyText() when browse mode is sticky

 src/orca/scripts/web/script_utilities.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/orca/scripts/web/script_utilities.py b/src/orca/scripts/web/script_utilities.py
index c381c60..da94b64 100644
--- a/src/orca/scripts/web/script_utilities.py
+++ b/src/orca/scripts/web/script_utilities.py
@@ -764,8 +764,8 @@ class Utilities(script_utilities.Utilities):
         return rv
 
     def queryNonEmptyText(self, obj, excludeNonEntryTextWidgets=True):
-        if not obj:
-            return None
+        if not (obj and self.inDocumentContent(obj)) or self._script.browseModeIsSticky():
+            return super().queryNonEmptyText(obj)
 
         if hash(obj) in self._text:
             return self._text.get(hash(obj))