报一个BUG

HtmlAttributesImpl中的方法

    public void setCssProperty(Component component, String querySelector, String propertyName, String value) {
        checkNotNullArgument(component);
        checkNotNullArgument(querySelector);
        checkNotNullArgument(propertyName);

        com.vaadin.ui.Component vComponent = component.unwrapComposition(com.vaadin.ui.Component.class);
        HtmlAttributesExtension.get(vComponent)
                .setCssProperty(querySelector, propertyName, value);
    }

当传入的component是Table.PlainTextCell时,vComponent是null,会导致后面的语句执行报空指针,这个地方应该加个为null的判断