Improve error message and use correct status
Improve error message and use correct status

chrishanes/pvb_prisoner_proto,arminio/govuk_prototype_kit,davedark/proto-timeline,samwake/hoddat-cofc-caseworking,Demwunz/esif-prototype,nhsbsa/ppc-prototype,paulpod/invgov,davedark/proto-timeline,Demwunz/esif-prototype,alphagov/govuk_prototype_kit,chrishanes/pvb_prisoner_proto,paulpod/invgov,dwpdigitaltech/hrt-prototype,OrcaTom/dwp_contentpatterns,karlparton/my-govuk,dwpdigitaltech/digital-debt,DilwoarH/GDS-Prototype-DM-SavedSearch,dwpdigitaltech/ejs-prototype,arminio/govuk_prototype_kit,rivalee/local-gov-links,chrishanes/pvb_prisoner_proto,rivalee/local-gov-links,danblundell/verify-local-patterns,karlparton/my-govuk,DilwoarH/GDS-Prototype-DM-SavedSearch,glancyea/tagtest,dwpdigitaltech/ejs-prototype,benjeffreys/hmcts-idam-proto,companieshouse/ch-accounts-prototype,benjeffreys/hmcts-idam-proto,danblundell/verify-local-patterns,glancyea/tagtest,joelanman/govuk_prototype_kit,tsmorgan/marx,dwpdigitaltech/digital-debt,Demwunz/esif-prototype,joelanman/govuk_prototype_kit,nhsbsa/ppc-prototype,quis/notify-public-research-prototype,BucksCountyCouncil/verify-local-patterns,tsmorgan/marx,gup-dwp/pip-prototype-v2,DilwoarH/GDS-Prototype-DM-SavedSearch,companieshouse/ch-accounts-prototype,LandRegistry/dmp-prototype,abbott567/govuk_prototype_kit,arminio/govuk_prototype_kit,BucksCountyCouncil/verify-local-patterns,abbott567/govuk_prototype_kit,LandRegistry/dmp-prototype,quis/notify-public-research-prototype,gup-dwp/pip-prototype-v2,tsmorgan/marx,nhsbsa/ppc-prototype,karlparton/my-govuk,alphagov/govuk_prototype_kit,abbott567/govuk_prototype_kit,dwpdigitaltech/hrt-prototype,dwpdigitaltech/digital-debt,alphagov/govuk_prototype_kit,davedark/proto-timeline,gup-dwp/pip-prototype-v2,gavinwye/govuk_prototype_kit,BucksCountyCouncil/verify-local-patterns,quis/notify-public-research-prototype,kenmaddison-scc/verify-local-patterns,dwpdigitaltech/hrt-prototype,kenmaddison-scc/verify-local-patterns,glancyea/tagtest,gavinwye/govuk_prototype_kit,samwake/hoddat-cofc-caseworking,hannalaakso/accessible-timeout-warning,OrcaTom/dwp_contentpatterns,paulpod/invgov,hannalaakso/accessible-timeout-warning,kenmaddison-scc/verify-local-patterns,hannalaakso/accessible-timeout-warning,dwpdigitaltech/ejs-prototype,benjeffreys/hmcts-idam-proto,OrcaTom/dwp_contentpatterns,joelanman/govuk_prototype_kit,danblundell/verify-local-patterns,samwake/hoddat-cofc-caseworking,LandRegistry/dmp-prototype