bin/ircd: fix a bug adding new msg with empty buffer

bin/ircd/src/privmsg.rs

@@ -31,6 +31,8 @@ impl PrivmsgsBuffer {
             if privmsg.timestamp > last_msg.timestamp {
                 self.0.push(privmsg.clone());
             }
+        } else {
+            self.0.push(privmsg.clone());
         }
     }