send exception to syslog for Google drive download

src/etc/inc/config.lib.inc

@@ -355,12 +355,16 @@ function backup_to_google_drive()
             $target_filename = "config-" . time() . ".xml";
             if (count($configfiles) > 1) {
                 // compare last backup with current, only save new
-                $bck_data_enc_in = $client->download($configfiles[array_keys($configfiles)[0]]);
-                $bck_data_enc = "";
-                tagfile_deformat($bck_data_enc_in, $bck_data_enc, "config.xml");
-                $bck_data = decrypt_data($bck_data_enc, $config->system->remotebackup->GDrivePassword->__toString());
-                if ($bck_data == $confdata) {
-                    $target_filename = null;
+                try {
+                    $bck_data_enc_in = $client->download($configfiles[array_keys($configfiles)[0]]);
+                    $bck_data_enc = "";
+                    tagfile_deformat($bck_data_enc_in, $bck_data_enc, "config.xml");
+                    $bck_data = decrypt_data($bck_data_enc, $config->system->remotebackup->GDrivePassword->__toString());
+                    if ($bck_data == $confdata) {
+                        $target_filename = null;
+                    }
+                }  catch (Exception $e) {
+                    log_error("unable to download " . $configfiles[array_keys($configfiles)[0]]->description . " from Google Drive (" . $e . ")");
                 }
             }
             if (!is_null($target_filename)) {