Bug 18822: Better error response

Bug 18822: Better error response

Apply this patch first to see a change in the error feedback - instead
of [Object object] you should get a text readable error

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 9e26419e30c88d8a9cd54660752fda89170ae3f8)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>