Fix for missing system console messages

[spelunkhead]

I noticed that system messages sent through the server console (e.g. say hello) were not showing up in my client. The error below appeared anytime one of these messages was sent. Adding a check for a null name fixed the error and allowed the messages to be shown again.

[01:37:52] [Render thread/ERROR]: Error executing task on Client
java.lang.NullPointerException: Cannot invoke "String.replaceAll(String, String)" because the return value of "dzwdz.chat_heads.config.ChatHeadsConfig.getProfileName(String)" is null
    at dzwdz.chat_heads.ChatHeads.getPlayerInfo(ChatHeads.java:195) ~[chat_heads-0.10.23-fabric-1.20.2.jar:?]
    at dzwdz.chat_heads.ChatHeads.detectPlayer(ChatHeads.java:146) ~[chat_heads-0.10.23-fabric-1.20.2.jar:?]
    at dzwdz.chat_heads.ChatHeads.handleAddedMessage(ChatHeads.java:113) ~[chat_heads-0.10.23-fabric-1.20.2.jar:?]
    at net.minecraft.client.network.message.MessageHandler.handler$zek000$chat_heads$chatheads$handleAddedDisguisedMessage(MessageHandler.java:1539) ~[client-intermediary.jar:?]
    at net.minecraft.client.network.message.MessageHandler.method_45745(MessageHandler.java) ~[client-intermediary.jar:?]
    at net.minecraft.client.network.message.MessageHandler.process(MessageHandler.java:88) ~[client-intermediary.jar:?]
    at net.minecraft.client.network.message.MessageHandler.onProfilelessMessage(MessageHandler.java:123) ~[client-intermediary.jar:?]
    at net.minecraft.client.network.ClientPlayNetworkHandler.onProfilelessChatMessage(ClientPlayNetworkHandler.java:885) ~[client-intermediary.jar:?]
    at net.minecraft.network.packet.s2c.play.ProfilelessChatMessageS2CPacket.apply(ProfilelessChatMessageS2CPacket.java:21) ~[client-intermediary.jar:?]
    at net.minecraft.network.packet.s2c.play.ProfilelessChatMessageS2CPacket.apply(ProfilelessChatMessageS2CPacket.java:8) ~[client-intermediary.jar:?]
    at net.minecraft.network.NetworkThreadUtils.method_11072(NetworkThreadUtils.java:23) ~[client-intermediary.jar:?]
    at net.minecraft.util.thread.ThreadExecutor.executeTask(ThreadExecutor.java:156) ~[client-intermediary.jar:?]
    at net.minecraft.util.thread.ReentrantThreadExecutor.executeTask(ReentrantThreadExecutor.java:23) ~[client-intermediary.jar:?]
    at net.minecraft.util.thread.ThreadExecutor.runTask(ThreadExecutor.java:130) ~[client-intermediary.jar:?]
    at net.minecraft.util.thread.ThreadExecutor.runTasks(ThreadExecutor.java:115) ~[client-intermediary.jar:?]
    at net.minecraft.client.MinecraftClient.render(MinecraftClient.java:1231) ~[client-intermediary.jar:?]
    at net.minecraft.client.MinecraftClient.run(MinecraftClient.java:856) ~[client-intermediary.jar:?]
    at net.minecraft.client.main.Main.main(Main.java:253) ~[minecraft-1.20.2-client.jar:?]
    at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:470) ~[fabric-loader-0.14.24.jar:?]
    at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.14.24.jar:?]
    at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) ~[fabric-loader-0.14.24.jar:?]
    at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:87) ~[NewLaunch.jar:?]
    at org.prismlauncher.EntryPoint.listen(EntryPoint.java:130) ~[NewLaunch.jar:?]
    at org.prismlauncher.EntryPoint.main(EntryPoint.java:70) ~[NewLaunch.jar:?]

[Fourmisain]

Phew, for a second I thought this applies to all server messages! While not the case, this is still an important bug, so big thanks for the PR!

This stems from 1d35f87a996fb15537f7c48df2f305925f33bd06 where I forgot to handle the case where a message has a sender decoration but no click event /tell <sender> command, which is exactly the case for /say and /tell commands from the server console (but not /tellraw and any other server messages).

I'll probably rework the fix but let's get this in anyway. New versions hopefully very soon!