Bug 22550: OPAC suggestion form doesn't require mandatory fields

Bug 22550: OPAC suggestion form doesn't require mandatory fields

Test plan:
1. OPAC->login->your purchase suggestions->New purchase suggestion
2. Click button "Submit your suggestion" directly without filling in any field.
   Empty suggestion record was added succeffully.
3. Apply the patch.
4. Click button "Submit your suggestion" directly without filling in any field.
   The required fields should be labeled in red.
   (you can change the mandatory fields by preference 'OPACSuggestionMandatoryFields')

Signed-off-by: Bin Wen <bin.wen@inlibro.com>
Signed-off-by: Jogiraju,T. <rajujogi.t@gmail.com>
Signed-off-by: Jogiraju,T. <rajujogi.t@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>