[calls] sip: origin: Bail when trying to dial empty string

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit 1b4e968e8e0611e85feac0bab2b5320110604026
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Fri Oct 29 01:01:59 2021 +0200

    sip: origin: Bail when trying to dial empty string

 plugins/sip/calls-sip-origin.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/plugins/sip/calls-sip-origin.c b/plugins/sip/calls-sip-origin.c
index 62b87aa1..ddf08582 100644
--- a/plugins/sip/calls-sip-origin.c
+++ b/plugins/sip/calls-sip-origin.c
@@ -275,7 +275,7 @@ dial (CallsOrigin *origin,
 
   name = calls_origin_get_name (origin);
 
-  if (address == NULL) {
+  if (!address || !*address) {
     g_warning ("Tried dialing on origin '%s' without an address",
                name);
     return;