vaadin-spring-boot-starter does not find widgetset with 8.0.5

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For bugs, please provide at minimum the following information:

• Vaadin version
  vaadin-bom 8.0.5, spring-boot 1.5.2.RELEASE, versions choosen by start.spring.io
  It works fine if I change vaadin version to 8.0.4
• Description of the bug
  Widgetset is not found, log message: Requested resource [/VAADIN/widgetsets/com.vaadin.DefaultWidgetSet/com.vaadin.DefaultWidgetSet.nocache.js] not found from filesystem or through class loader. Add widgetset and/or theme JAR to your classpath or add files to WebContent/VAADIN folder.
• If possible, minimal reproducible example

import com.vaadin.annotations.Theme;
import com.vaadin.server.VaadinRequest;
import com.vaadin.spring.annotation.SpringUI;
import com.vaadin.ui.Label;
import com.vaadin.ui.UI;

@SpringUI
@Theme("valo")
public class MyUI extends UI {
    @Override
    protected void init(VaadinRequest request) {
        setContent(new Label("Hello, World!"));
    }
}

Start by reproducing the issue with the provided MyUI example, Vaadin 8.0.5, Spring Boot 1.5.2.RELEASE, and the vaadin-bom version shown. Investigate why the requested DefaultWidgetSet resource is missing; done means the example loads without the widgetset-not-found message.