Bug 17300: Fix serials search

Bug 17300: Fix serials search

Since bug 16157, the location value is always "All" and the serial
search won't return anything.

Test plan:
Search for some serials.
Without this patch, it won't return any results
With this patch applied, the result search should be consistent

Reproduced with serial's "Advanced search" and search filter in
left hand column. Fixed by this patch.
Signed-off-by: Marc <veron@veron.ch>
Advanced search works fine again.
Signed-off-by: Andreas Roussos <arouss1980@gmail.com>
Signed-off-by: Katrin Fischer  <katrin.fischer@bsz-bw.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>