add error_email to whitelist

controllers/main.py

@@ -5,6 +5,7 @@ from odoo.addons.auth_signup.controllers.main import AuthSignupHome
 
 # add firstname and lastname to qcontext whitelist
 SIGN_UP_REQUEST_PARAMS.update({"firstname", "lastname"})
+SIGN_UP_REQUEST_PARAMS.update({"error_email"})
 
 class SolagroAuthSignupHome(AuthSignupHome):
     @http.route('/web/signup', type='http', auth='public', website=True, sitemap=False)