Removed check for manager getters

src/main/java/net/minestom/server/MinecraftServer.java

@@ -57,7 +57,6 @@ import org.slf4j.LoggerFactory;
 import java.io.IOException;
 import java.net.Proxy;
 import java.security.KeyPair;
-import java.util.Objects;
 
 /**
  * The main server class used to start the server and retrieve all the managers.
@@ -623,9 +622,9 @@ public class MinecraftServer {
     }
 
     private static void checkInitStatus(@Nullable Object object) {
-        Check.stateCondition(Objects.isNull(object),
+        /*Check.stateCondition(Objects.isNull(object),
                 "You cannot access the manager before MinecraftServer#init, " +
-                        "if you are developing an extension be sure to retrieve them at least after Extension#preInitialize");
+                        "if you are developing an extension be sure to retrieve them at least after Extension#preInitialize");*/
     }
 
 }

src/main/java/net/minestom/server/command/builder/Arguments.java

@@ -26,7 +26,6 @@ public class Arguments {
 
     private Map<String, Object> args = new HashMap<>();
 
-    @Nullable
     public boolean getBoolean(@NotNull String id) {
         return (boolean) getObject(id);
     }