When none of In-Portal themes is enabled and marked as primary, then user only sees empty blank screen instead of Front-End. Debugger also appears hidden.
I guess, that a message should be shown to the user, explaining the problem.
During debugging revealed that application interrupts in kApplication::Init method. Further debugging showed that problem is in the kApplication::ApplicationDie method:
core/kernel/application.php
/**
* Stops processing of user request and displays given message
*
* @param string $message
* @access public
*/
public function ApplicationDie($message = '')
{
$message = ob_get_clean() . $message;
if ( $this->isDebugMode() ) {
$message .= $this->Debugger->printReport(true);
}
echo $this->UseOutputCompression() ? gzencode($message, DBG_COMPRESSION_LEVEL) : $message;
exit;
}
Output of this code will be done in buffer and never be showed.