Fixed error case for linux notifications, by checking zenity version, to do fallback for notify-send, if it exists, otherwise using zenity --info, with a faked timeout if necessary.

modules/message-box.js

@@ -171,6 +171,20 @@ function linux_messageBox()
                 })()
             });
     }
+    else
+    {
+        Object.defineProperty(this, 'notifysend',
+            {
+                value: (function ()
+                {
+                    var child = require('child_process').execFile('/bin/sh', ['sh']);
+                    child.stdout.str = ''; child.stdout.on('data', function (chunk) { this.str += chunk.toString(); });
+                    child.stdin.write("whereis notify-send | awk '{ print $2 }'\nexit\n");
+                    child.waitExit();
+                    return (child.stdout.str.trim() == '' ? null : { path: child.stdout.str.trim() });
+                })()
+            });
+    }
 
     this.create = function create(title, caption, timeout)
     {