Fixed series without images

Sermons with a series that didn't have an image would display
an ugly white box. Removed the box and the image tag if there
is no image to go with the series.
Fixed breadcrumbs in sermons without a series

Single sermons without a series would display like the previously
broken breadcrumbs.
Merge pull request #3 from noahmorrison/master

Fixed series without images and sermons without series.