Bug 27356: Don't hide the SMTP servers table when last displayed is deleted

Bug 27356: Don't hide the SMTP servers table when last displayed is deleted

Found on bug 27251 which was mimicking SMTP server code for QOTD.

To recreate:
Create a SMTP server with name "a"
Create a SMTP server with name "aa"

Filter by "aa"
=> Only 1 row displayed

Delete it, confirm
=> The table disappears

Note that we could re-add this test when bug 27353 will be pushed, as
recordsTotal will contain the unfiltered number of records in the DB.

Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>