libotutil: Allow missing groups when getting key values with default

Prep commit as part of #1814, where a new `sysroot` group is added
to the repo config. This allows falling back to a default key value
if the specified group does not exist in the config file.

src/libotutil/ot-keyfile-utils.c

@@ -46,7 +46,8 @@ ot_keyfile_get_boolean_with_default (GKeyFile      *keyfile,
   ret_bool = g_key_file_get_boolean (keyfile, section, value, &temp_error);
   if (temp_error)
     {
-      if (g_error_matches (temp_error, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_KEY_NOT_FOUND))
+      if (g_error_matches (temp_error, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_KEY_NOT_FOUND)
+          || g_error_matches (temp_error, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_GROUP_NOT_FOUND))
         {
           g_clear_error (&temp_error);
           ret_bool = default_value;
@@ -83,7 +84,8 @@ ot_keyfile_get_value_with_default (GKeyFile      *keyfile,
   ret_value = g_key_file_get_value (keyfile, section, value, &temp_error);
   if (temp_error)
     {
-      if (g_error_matches (temp_error, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_KEY_NOT_FOUND))
+      if (g_error_matches (temp_error, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_KEY_NOT_FOUND)
+          || g_error_matches (temp_error, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_GROUP_NOT_FOUND))
         {
           g_clear_error (&temp_error);
           ret_value = g_strdup (default_value);