fix(CommandDialog, update): avoid oob access when command box is empty (#4)

Author: ant2a

bundles/org.vcml.explorer.ui/src/org/vcml/explorer/ui/dialogs/CommandDialog.java

@@ -83,8 +83,7 @@ private void execute() {
 
     private void update() {
         String[] args = commandBoxInput.getText().split(" ");
-        String name = args[0];
-        command = module.findCommand(name);
+        command = (args.length > 0) ? module.findCommand(args[0]) : null;
         execBtn.setEnabled(false);
         if (command == null) {
             commandBoxLabel.setText("invalid command '" + commandBoxInput.getText() + "'");