Catch errors when submitting registration

frontend/src/routes/sponsor/register/stepRegistration.tsx

@@ -124,6 +124,7 @@ export default function StepRegistration() {
           })
         }
       })
+      .catch()
       .finally(() => {
         setSubmitState(SubmitState.SubmitSuccess)
         setActiveStep(Steps.SuccessStep)