[orca] Gracefully handle app going defunct on us

[Joanmarie Diggs <joanied src gnome org>]

commit e8cfb48d96e35b2651e4ae8dffaa7ee65d0b9c14
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Sep 9 14:02:49 2019 +0200

    Gracefully handle app going defunct on us

 src/orca/script_utilities.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/src/orca/script_utilities.py b/src/orca/script_utilities.py
index 7a41b7c31..cee9d87e1 100644
--- a/src/orca/script_utilities.py
+++ b/src/orca/script_utilities.py
@@ -128,7 +128,12 @@ class Utilities:
         if not app:
             return ""
 
-        pid = app.get_process_id()
+        try:
+            pid = app.get_process_id()
+        except:
+            msg = "ERROR: Exception getting process id of %s. May be defunct." % app
+            debug.println(debug.LEVEL_INFO, msg, True)
+            return ""
 
         try:
             cmdline = subprocess.getoutput("cat /proc/%s/cmdline" % pid)