fix(unblock): rethrow customs server error when account is unknown

lib/routes/account.js

@@ -512,6 +512,9 @@ module.exports = function (
                     email: email,
                     errno: err.errno
                   })
+                  if (customsErr) {
+                    throw customsErr
+                  }
                 }
                 throw err
               }

test/local/account_routes.js

@@ -1476,6 +1476,11 @@ describe('/account/login', function () {
         mockCustoms.check = () => P.reject(error.requestBlocked(true))
       })
 
+      beforeEach(() => {
+        mockLog.activityEvent.reset()
+        mockLog.flowEvent.reset()
+      })
+
       after(() => {
         mockCustoms.check = oldCheck
       })
@@ -1516,6 +1521,15 @@ describe('/account/login', function () {
         describe('with unblock code', () => {
           mockLog.flowEvent.reset()
 
+          let previousEmailRecord
+          before(() => {
+            previousEmailRecord = mockDB.emailRecord
+          })
+
+          afterEach(() => {
+            mockDB.emailRecord = previousEmailRecord
+          })
+
           it('invalid code', () => {
             mockDB.consumeUnblockCode = () => P.reject(error.invalidUnblockCode())
             return runTest(route, mockRequestWithUnblockCode).then(() => assert.ok(false), err => {
@@ -1542,6 +1556,14 @@ describe('/account/login', function () {
             })
           })
 
+          it('unknown account', () => {
+            mockDB.emailRecord = () => P.reject(new error.unknownAccount())
+            return runTest(route, mockRequestWithUnblockCode).then(() => assert(false), err => {
+              assert.equal(err.errno, error.ERRNO.REQUEST_BLOCKED)
+              assert.equal(err.output.statusCode, 400)
+            })
+          })
+
           it('valid code', () => {
             mockDB.consumeUnblockCode = () => P.resolve({ createdAt: Date.now() })
             return runTest(route, mockRequestWithUnblockCode, (res) => {