[Emacspeak] Patch: don't read scroll percentage without a notification stream

[Tyler Spivey <tspivey@xxxxxxxxxx>]

Scrolling with C-v and M-v tries to read the percentage through the 
buffer using the notification stream. If it's not active, the percentage 
interrupts the text.

This patch checks to see whether dtk-notify-process is set before 
reading the percentage.

diff --git a/lisp/emacspeak-advice.el b/lisp/emacspeak-advice.el
index 03747d2ed..f91fb96d0 100644
--- a/lisp/emacspeak-advice.el
+++ b/lisp/emacspeak-advice.el
@@ -431,10 +431,11 @@ When on a close delimiter, speak matching 
delimiter after a small delay. "
      (when (ems-interactive-p)
        (emacspeak-icon 'scroll)
        (dtk-speak (emacspeak-get-window-contents))
-       (dtk-notify-speak
-        (propertize
-         (format "%s " (emacspeak-get-current-percentage-into-buffer))
-         'personality voice-smoothen))))))
+       (when dtk-notify-process
+         (dtk-notify-speak
+          (propertize
+           (format "%s " (emacspeak-get-current-percentage-into-buffer))
+           'personality voice-smoothen)))))))

 ;;;  Advise modify case commands to speak