fix(core): Handles a rare NPE with LoginTimer (#508)

Projects/UOContent/Accounting/AccountHandler.cs

@@ -403,10 +403,8 @@ namespace Server.Misc
 
                 Console.WriteLine("Login: {0}: Past IP limit threshold", e.State);
 
-                using (var op = new StreamWriter("ipLimits.log", true))
-                {
-                    op.WriteLine("{0}\tPast IP limit threshold\t{1}", e.State, DateTime.UtcNow);
-                }
+                using var op = new StreamWriter("ipLimits.log", true);
+                op.WriteLine("{0}\tPast IP limit threshold\t{1}", e.State, DateTime.UtcNow);
 
                 return;
             }
@@ -414,7 +412,7 @@ namespace Server.Misc
             var un = e.Username;
             var pw = e.Password;
 
-            if (!(Accounts.GetAccount(un) is Account acct))
+            if (Accounts.GetAccount(un) is not Account acct)
             {
                 e.Accepted = false;
             }

Projects/UOContent/Accounting/Security/SHA2PasswordProtection.cs

@@ -15,7 +15,6 @@
 
 using System;
 using System.Security.Cryptography;
-using System.Text;
 using Server.Text;
 
 namespace Server.Accounting.Security

Projects/UOContent/Items/Books/BookPackets.cs

@@ -13,7 +13,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  *************************************************************************/
 
-using System;
 using System.Buffers;
 using System.IO;
 using Server.Network;

Projects/UOContent/Items/Misc/Corpses/Corpse.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Runtime.CompilerServices;
 using Server.ContextMenus;
 using Server.Engines.PartySystem;
 using Server.Engines.Quests.Doom;

Projects/UOContent/Items/Weapons/Abilities/FrenziedWhirlwind.cs

@@ -1,7 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
-using Server.Mobiles;
 using Server.Spells;
 
 namespace Server.Items

Projects/UOContent/Misc/PacketThrottles.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Globalization;
 using System.IO;
 using Server.Json;
 using Server.Mobiles;

Projects/UOContent/Multis/Boats/BaseBoat.cs

@@ -1,9 +1,7 @@
 using System;
-using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.CompilerServices;
-using Server.Collections;
 using Server.Items;
 using Server.Multis.Boats;
 using Server.Network;