Fix null profile key breaking nullability contracts for PlayerProfile API (#8233)

patches/server/Add-some-minimal-debug-information-to-chat-packet-er.patch

@@ -10,8 +10,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
 +++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
 @@ -0,0 +0,0 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
- 
-     private boolean tryHandleChat(String message, Instant timestamp, LastSeenMessages.Update acknowledgment) {
+         }
+         // Paper end
          if (!this.updateChatOrder(timestamp)) {
 -            ServerGamePacketListenerImpl.LOGGER.warn("{} sent out-of-order chat: '{}'", this.player.getName().getString(), message);
 +            ServerGamePacketListenerImpl.LOGGER.warn("{} sent out-of-order chat: '{}': {} > {}", this.player.getName().getString(), message, this.lastChatTimeStamp.get().getEpochSecond(), timestamp.getEpochSecond()); // Paper