ringer bugfixes (#36936)

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Content.Server/PDA/Ringer/RingerSystem.cs

@@ -55,7 +55,6 @@ public sealed class RingerSystem : SharedRingerSystem
     /// </summary>
     private void OnGenerateUplinkCode(Entity<RingerUplinkComponent> ent, ref GenerateUplinkCodeEvent ev)
     {
-        // Generate a new uplink code
         var code = GenerateRingtone();
 
         // Set the code on the component
@@ -74,6 +73,10 @@ public sealed class RingerSystem : SharedRingerSystem
         if (!HasComp<StoreComponent>(uid))
             return false;
 
+        // Wasn't generated yet
+        if (uplink.Code is null)
+            return false;
+
         // On the server, we always check if the code matches
         if (!uplink.Code.SequenceEqual(ringtone))
             return false;