empty h3 in popover when title is not defined

Created by: stevenbriscoeca

Operating system Windows Browser and version Chrome 73 Reduced test case https://getbootstrap.com/docs/4.3/components/popovers/#four-directions

On popovers that do not have a title defined, the h3 is still there as empty. I feel this could be an accessibility problem having an empty h3 on the page :

I would make sure the h3 disappears if the title is not defined.