don't return error for empty claim

frontend/templates/claim.html

@@ -4,6 +4,7 @@
 {% block doccontent %}
 
 <h2>Rights Holder Claim Form </h2>
+{% if work %}
 <h3> Rightsholder making claim </h3>
 {{ rights_holder.rights_holder_name }}
 <h3> Work being claimed  </h3>
@@ -42,4 +43,7 @@
         <input type="submit" name="submit" value="Confirm Claim">
     </form>
 {% endif %}
+{% else %}
+Please find a work to claim.
+{% endif %}
 {% endblock %}

frontend/urls.py

@@ -35,7 +35,7 @@ urlpatterns = [
     url(r"^rightsholders/campaign/(?P<id>\d+)/mademobi/$", views.manage_campaign, {'action': 'mademobi'}, name="mademobi"),
     url(r"^rightsholders/edition/(?P<work_id>\d*)/(?P<edition_id>\d*)$", views.edit_edition, {'by': 'rh'}, name="rh_edition"),
     url(r"^rightsholders/edition/(?P<edition_id>\d*)/upload/$", views.edition_uploads, name="edition_uploads"),
-    url(r"^rightsholders/claim/$", views.claim, name="claim"), 
+    url(r"^rightsholders/claim/$", login_required(views.claim), name="claim"), 
     url(r"^rightsholders/surveys/$", views.surveys, name="surveys"), 
     url(r"^rightsholders/new_survey/(?P<work_id>\d*)/?$", views.new_survey, name="new_survey"),
     url(r"^rightsholders/surveys/answers_(?P<qid>\d+)_(?P<work_id>\d*).csv$", views.export_surveys, name="survey_answers"),

frontend/views/rh_views.py

@@ -88,6 +88,8 @@ class ClaimView(CreateView):
         return HttpResponseRedirect(reverse('rightsholders'))
 
     def get_context_data(self, form):
+        if not form.is_valid():
+            return {'form': form}
         work = form.cleaned_data['work']
         rights_holder = form.cleaned_data['rights_holder']
         active_claims = work.claim.exclude(status = 'release')