[#5825] improvement(CLI): Update the error message for creating a met…

…alake when the required parameter is missing.

Currently, when a metalake is created without specifying the metalake argument, the message "Cannot parse a null or empty identifier" is displayed. This message is unclear and lacks helpful guidance for the user. Update the message to: "! metalake is not defined" to make it more user-friendly and informative.

fix some change

clients/cli/src/main/java/org/apache/gravitino/cli/GravitinoCommandLine.java

@@ -28,9 +28,11 @@
 import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 import java.util.Map;
+import java.util.Objects;
 import org.apache.commons.cli.CommandLine;
 import org.apache.commons.cli.HelpFormatter;
 import org.apache.commons.cli.Options;
+import org.apache.gravitino.MetadataObject;
 import org.apache.gravitino.cli.commands.Command;
 
 /* Gravitino Command line */
@@ -174,6 +176,10 @@ private void handleMetalakeCommand() {
     } else if (CommandActions.LIST.equals(command)) {
       newListMetalakes(url, ignore, outputFormat).handle();
     } else if (CommandActions.CREATE.equals(command)) {
+      if (Objects.isNull(metalake)) {
+        System.err.println("! " + MetadataObject.Type.METALAKE.name() + " is not defined");
+        return;
+      }
       String comment = line.getOptionValue(GravitinoOptions.COMMENT);
       newCreateMetalake(url, ignore, metalake, comment).handle();
     } else if (CommandActions.DELETE.equals(command)) {