Bug #260 fix: Makes UI show missing storage volume information

Volume information uses 'overflow' and 'text-overflow' properties,
but they were not working properly because text was being hidden.
This patch adds 'white-space: nowrap' property, which fixes the
problem and shows the text 'ellipsis'ed, as expected.

Signed-off-by: Rodrigo Trujillo <rodrigo.trujillo@linux.vnet.ibm.com>