Bug 15722: Escape patron infos for JSON in patron searches

 Bug 15722: Escape patron infos for JSON in patron searches

If patron infos contain invalid JSON chars (\t for instance), the
results won't appear.
The solution is to escape these info.

Test plan:
Edit patron infos in DB (update borrowers set surname="foobar\t" where
borrowernumber=42)
Search for foobar (you should have more than 1 result)
Without this patch, DT retrieves a bad formatted JSON and the results
won't appear.
With this patch, the table result appears

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>