#3 Add null chack for command name

Signed-off-by: Emmanuel Bigeon <emmanuel@bigeon.fr>

gclc/src/main/java/net/bigeon/gclc/command/Command.java

@@ -75,6 +75,9 @@ public abstract class Command implements ICommand {
      * @param name the command name */
     public Command(final String name) {
         super();
+        if (name == null) {
+            throw new IllegalArgumentException("The command name is mandatory");
+        }
         this.name = name;
     }