Fix issue#5: Bug in updating Group Settings.

Change the default value of address.timezone property.

config/config.exs

@@ -128,7 +128,7 @@ config :mobilizon, Mobilizon.Web.Email.Mailer,
   tls_options: [
     verify: :verify_peer,
     versions: [:"tlsv1.2", :"tlsv1.3"],
-    cacerts: if :public_key.cacerts_load(System.get_env("SSL_CERT_FILE")) == :ok do
+    cacerts: if System.get_env("SSL_CERT_FILE") != nil and :public_key.cacerts_load(System.get_env("SSL_CERT_FILE")) == :ok do
         :public_key.cacerts_get()
       end,
     server_name_indication: ~c"localhost",

js/src/types/address.model.ts

@@ -48,7 +48,7 @@ export class Address implements IAddress {
 
   geom?: string = "";
 
-  timezone?: string = "";
+  timezone?: string;
 
   constructor(hash?: IAddress) {
     if (!hash) return;