[connections] application: Show the correct connection identifier when deleting

[Felipe Borges <felipeborges src gnome org>]

commit 7830f140a58aad6e7c9b0ed931673630d66a8035
Author: Felipe Borges <felipeborges gnome org>
Date:   Tue May 18 16:31:57 2021 +0200

    application: Show the correct connection identifier when deleting
    
    This is a regression introduced by the previous commits.

 src/application.vala | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/application.vala b/src/application.vala
index b98ca0b..4c530db 100644
--- a/src/application.vala
+++ b/src/application.vala
@@ -154,7 +154,8 @@ namespace Connections {
                 }
             }
 
-            var message = _("Connection to “%s” has been deleted").printf (connection.display_name);
+            var message = _("Connection to “%s” has been deleted").printf (connection.display_name != "" && 
connection.display_name != null ?
+                                                                           connection.display_name : 
connection.uri);
             main_window.notifications_bar.display_for_action (message,
                                                               _("Undo"),
                                                               (owned) undo,