[easytag] Fix help action on Windows

[David King <davidk src gnome org>]

commit 9866e92a905d085758532735cfb1f8928a9c3b39
Author: David King <amigadave amigadave com>
Date:   Wed Nov 16 20:16:22 2016 +0000

    Fix help action on Windows

 src/application.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/application.c b/src/application.c
index ea0c196..440db7e 100644
--- a/src/application.c
+++ b/src/application.c
@@ -61,6 +61,10 @@ on_help (GSimpleAction *action,
         g_debug ("Error while opening help: %s", error->message);
         g_clear_error (&error);
     }
+    else
+    {
+        return;
+    }
 
     gtk_show_uri (gtk_window_get_screen (GTK_WINDOW (MainWindow)),
                   "https://help.gnome.org/users/easytag/stable/";,