Issue #2540794 by Eli-T, cilefen, karishmaamin, cosmicdreams, yoroy:...
Issue #2540794 by Eli-T, cilefen, karishmaamin, cosmicdreams, yoroy: Configuration synchronization UI does not distinguish between an empty staged configuration, and staged configuration that matches active
'#empty'=>$this->t('There are no configuration changes to import.'),
'#empty'=>empty($source_list)?$this->t('There is no staged configuration.'):$this->t('The staged configuration is identical to the active configuration.'),
$this->assertSession()->pageTextNotContains('The following items in your active configuration have changes since the last import that may be lost on the next import.');
$this->assertSession()->pageTextContains('There are no configuration changes to import.');
$this->assertSession()->pageTextContains('There is no staged configuration.');
// Write a file to sync. The warning about differences between the active