fix: handle uppercase and missing user verification (#44444)

* fix: hotfix for isHonest null

* fix: early return if no user?

* fix: handle invalid input on api

Also lowerCases the username it receives since the client could send any
case.

* fix: report errors to user when verification fails

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

client/src/templates/Introduction/components/cert-challenge.tsx

@@ -91,12 +91,22 @@ const CertChallenge = ({
       void (async () => {
         try {
           const data = await getVerifyCanClaimCert(username, superBlock);
-          const { status, result } = data?.response?.message;
-          setCanClaimCert(status);
-          setCertVerificationMessage(result);
-          setVerificationComplete(true);
+          if (data?.message) {
+            setCanClaimCert(false);
+            createFlashMessage(data.message);
+          } else {
+            const { status, result } = data?.response?.message;
+            setCanClaimCert(status);
+            setCertVerificationMessage(result);
+          }
         } catch (e) {
-          // TODO: How do we handle errors...?
+          console.error(e);
+          createFlashMessage({
+            type: 'danger',
+            message: FlashMessages.ReallyWeird
+          });
+        } finally {
+          setVerificationComplete(true);
         }
       })();
     }

client/src/utils/ajax.ts

@@ -1,5 +1,6 @@
 import cookies from 'browser-cookies';
 import envData from '../../../config/env.json';
+import { FlashMessageArg } from '../components/Flash/redux';
 
 import type {
   ChallengeFile,
@@ -172,6 +173,7 @@ export interface GetVerifyCanClaimCert {
   };
   isCertMap: ClaimedCertifications;
   completedChallenges: CompletedChallenge[];
+  message?: FlashMessageArg;
 }
 
 export function getVerifyCanClaimCert(