fix(form): fix #106

* use Optional validator

hiboo/account/forms.py

@@ -38,6 +38,6 @@ class PasswordForm(flask_wtf.FlaskForm):
 
 
 class ContactForm(flask_wtf.FlaskForm):
-    email = fields.StringField(_("Email address"), [validators.Email()])
-    matrix = fields.StringField(_("Matrix ID"), [])
+    email = fields.StringField(_("Email address"), [validators.Email(), validators.Optional()])
+    matrix = fields.StringField(_("Matrix ID"), [validators.Optional()])
     submit = fields.SubmitField(_("Update contact info"))