exception when attempting to add an unknown counter type

[crashdemons]

minor bug though since it only shows an error and only happens when you type the wrong thing in a command.

26.09 00:37:21 [Server] ERROR null
26.09 00:37:21 [Server] INFO org.bukkit.command.CommandException: Unhandled exception executing command 'counter' in plugin LoreKillCounter v2.0.3-SNAPSHOT
26.09 00:37:21 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at org.bukkit.craftbukkit.v1_16_R2.CraftServer.dispatchCommand(CraftServer.java:800) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.PlayerConnection.handleCommand(PlayerConnection.java:1908) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.PlayerConnection.a(PlayerConnection.java:1719) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.PlayerConnectionUtils.lambda$ensureMainThread$1(PlayerConnectionUtils.java:23) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.TickTask.run(SourceFile:18) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.MinecraftServer.ba(MinecraftServer.java:1135) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.MinecraftServer.executeNext(MinecraftServer.java:1128) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.IAsyncTaskHandler.executeAll(IAsyncTaskHandler.java:95) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.MinecraftServer.a(MinecraftServer.java:1264) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.MinecraftServer.w(MinecraftServer.java:999) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at net.minecraft.server.v1_16_R2.MinecraftServer.lambda$a$0(MinecraftServer.java:177) ~[patched_1.16.3.jar:git-Paper-191]
26.09 00:37:21 [Server] INFO at java.lang.Thread.run(Thread.java:748) [?:1.8.0_251]
26.09 00:37:21 [Server] INFO Caused by: java.lang.NullPointerException
26.09 00:37:21 [Server] INFO at com.github.crashdemons.lorekillcounter.CounterCommandExecutor.addCounter(CounterCommandExecutor.java:35) ~[?:?]
26.09 00:37:21 [Server] INFO at com.github.crashdemons.lorekillcounter.CounterCommandExecutor.onCommand(CounterCommandExecutor.java:110) ~[?:?]
26.09 00:37:21 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[patched_1.16.3.jar:git-Paper-191]