ike: do not log empty notify array

Ticket: #5167

rust/src/ike/logger.rs

@@ -214,11 +214,13 @@ fn log_ikev2(tx: &IKETransaction, jb: &mut JsonBuilder) -> Result<(), JsonError>
     jb.open_object("ikev2")?;
 
     jb.set_uint("errors", tx.errors as u64)?;
+    if !tx.notify_types.is_empty() {
         jb.open_array("notify")?;
         for notify in tx.notify_types.iter() {
             jb.append_string(&format!("{:?}", notify))?;
         }
         jb.close()?;
+    }
     jb.close()?;
     Ok(())
 }