[orca] Load/unload mouse reviewer when settings are reloaded

[Joanmarie Diggs <joanied src gnome org>]

commit 056805731a9167eed664339cf5b02de77ba32f03
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Tue Mar 27 11:39:13 2018 -0400

    Load/unload mouse reviewer when settings are reloaded

 src/orca/mouse_review.py |    6 +++++-
 src/orca/orca.py         |    6 ++++++
 2 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/src/orca/mouse_review.py b/src/orca/mouse_review.py
index dc81595..2c66698 100644
--- a/src/orca/mouse_review.py
+++ b/src/orca/mouse_review.py
@@ -291,7 +291,11 @@ class MouseReviewer:
             return None
 
         app = None
-        pid = window.get_application().get_pid()
+        windowApp = window.get_application()
+        if not windowApp:
+            return None
+
+        pid = windowApp.get_pid()
         for a in pyatspi.Registry.getDesktop(0):
             if a.get_process_id() == pid:
                 app = a
diff --git a/src/orca/orca.py b/src/orca/orca.py
index 363c4f8..6ab3922 100644
--- a/src/orca/orca.py
+++ b/src/orca/orca.py
@@ -70,6 +70,7 @@ from . import event_manager
 from . import keybindings
 from . import logger
 from . import messages
+from . import mouse_review
 from . import notification_messages
 from . import orca_state
 from . import orca_platform
@@ -377,6 +378,11 @@ def loadUserSettings(script=None, inputEvent=None, skipReloadMessage=False):
             msg = 'ORCA: Could not initialize connection to braille.'
             debug.println(debug.LEVEL_WARNING, msg, True)
 
+    if _settingsManager.getSetting('enableMouseReview'):
+        mouse_review.reviewer.activate()
+    else:
+        mouse_review.reviewer.deactivate()
+
     if _settingsManager.getSetting('enableSound'):
         player.init()