simplified resume errors

- result.login & consent won't be used anyway
- createError not needed when ctx is involved

lib/shared/resume.js

@@ -1,5 +1,3 @@
-const assert = require('assert');
-const createError = require('http-errors');
 const uuid = require('uuid/v4');
 const url = require('url');
 const _ = require('lodash');
@@ -32,16 +30,9 @@ module.exports = function getResumeAction(provider) {
     ctx.cookies.set(provider.cookieName('resume'), null, clearOpts);
 
     if (result.error) {
-      assert(!result.login, 'login shouldn\'t be provided with an error result');
-      assert(!result.consent, 'consent shouldn\'t be provided with an error result');
-      assert(typeof result.error === 'string', 'error should be a string');
-
-      const description = result.error_description
-        ? { error_description: result.error_description }
-        : undefined;
-      const err = createError(400, result.error, description);
-
-      ctx.throw(err);
+      ctx.throw(400, result.error, {
+        error_description: result.error_description,
+      });
     }
 
     if (result.login) {