bitbake: toaster: Make sure layer branch only shows when not empty

bitbake: toaster: Make sure layer branch only shows when not empty

In the recipe details and package details pages, the layer branch
definition list elements should only show when the branch field in
the database is populated. If the branch field is empty, we don't
show them.

The patch also removes all unnecessary data-toggle and
data-original-title attributes.

[YP #6152]

(Bitbake rev: 72adcadb931519f803dad7488544767241561fb7)

Signed-off-by: Belen Barros Pena <belen.barros.pena@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>