monitoring/commands: Add `TransportException'

`TransportException' should be thrown if a command was not sent.

refs #6593

modules/monitoring/library/Monitoring/Command/Exception/TransportException.php

@@ -0,0 +1,12 @@
+<?php
+// {{{ICINGA_LICENSE_HEADER}}}
+// {{{ICINGA_LICENSE_HEADER}}}
+
+namespace Icinga\Module\Monitoring\Command\Exception;
+
+use Icinga\Exception\IcingaException;
+
+/**
+ * Exception thrown if a command was not sent
+ */
+class TransportException extends IcingaException {}