Bug 22475: Shelving location doesn't appear on tags list view

Bug 22475: Shelving location doesn't appear on tags list view

This patch corrects the tags list view so that shelving location appears
correctly. Previously the template tried to display a variable which was
empty.

To test, apply the patch and locate an title which has both a tag
applied to it and a shelving location defined for one or more items. Go
to Tools -> Tags and click the tag to view titles with that tag. In the
location column of the table the shelving location should appear along
with library and call number.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>