Do not send error mails on CLI, instead print debug backtrace

MDErrorReporter.php

@@ -157,6 +157,11 @@ final public function sendDebugMail(string $to, string $subject = "", string $de
 
         $msg .= $this->_formulateDebugMailSection("Debug backtrace", debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT));
 
+        if (PHP_SAPI === 'cli') {
+            echo $msg;
+            exit;
+        }
+
         // Append the contents of $_SERVER
         if (!empty($_SERVER)) {
             $msg .= $this->_formulateDebugMailSection("The current content of \$_SERVER", $_SERVER);