[evolution-ews/gnome-42] EWS registry backend: Handle gracefully when Host URL is not set

[Milan Crha <mcrha src gnome org>]

commit db63e383db5187827070cdd7978069d1a8924d77
Author: Milan Crha <mcrha redhat com>
Date:   Wed May 18 14:57:32 2022 +0200

    EWS registry backend: Handle gracefully when Host URL is not set
    
    It can happen the Host URL is not set, for example when the account
    is created in GOA and the autodiscovery fails. Rather than claim
    a set of runtime warnings on the evolution-source-registry console,
    handle this case gracefully.

 src/EWS/registry/e-ews-backend.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)
---
diff --git a/src/EWS/registry/e-ews-backend.c b/src/EWS/registry/e-ews-backend.c
index 26ce2e9f..816c82a9 100644
--- a/src/EWS/registry/e-ews-backend.c
+++ b/src/EWS/registry/e-ews-backend.c
@@ -1136,7 +1136,18 @@ ews_backend_get_destination_address (EBackend *backend,
        g_return_val_if_fail (ews_settings != NULL, FALSE);
 
        host_url = camel_ews_settings_dup_hosturl (ews_settings);
-       g_return_val_if_fail (host_url != NULL, FALSE);
+       if (!host_url) {
+               ESource *source;
+               ESourceAuthentication *auth_extension;
+
+               source = e_backend_get_source (backend);
+               auth_extension = e_source_get_extension (source, E_SOURCE_EXTENSION_AUTHENTICATION);
+
+               *host = e_source_authentication_dup_host (auth_extension);
+               *port = e_source_authentication_get_port (auth_extension);
+
+               return *host && **host;
+       }
 
        soup_uri = soup_uri_new (host_url);
        if (soup_uri) {
@@ -1294,6 +1305,7 @@ e_ews_backend_ref_connection_sync (EEwsBackend *backend,
 {
        EEwsConnection *connection = NULL;
        ESourceAuthenticationResult local_result;
+       ESource *source;
        CamelEwsSettings *settings;
        gchar *hosturl;
        gboolean success;
@@ -1310,9 +1322,19 @@ e_ews_backend_ref_connection_sync (EEwsBackend *backend,
        if (connection != NULL || !backend->priv->credentials)
                return connection;
 
+       source = e_backend_get_source (E_BACKEND (backend));
        settings = ews_backend_get_settings (backend);
        hosturl = camel_ews_settings_dup_hosturl (settings);
-       connection = e_ews_connection_new_full (e_backend_get_source (E_BACKEND (backend)), hosturl, 
settings, FALSE);
+       if (!hosturl) {
+               g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT, "Host URL not set");
+
+               if (result)
+                       *result = E_SOURCE_AUTHENTICATION_ERROR;
+
+               return NULL;
+       }
+
+       connection = e_ews_connection_new_full (source, hosturl, settings, FALSE);
        g_free (hosturl);
 
        e_binding_bind_property (