* MWLogger service provider that creates \Psr\Log\NullLogger instances.
* A NullLogger silently discards all log events sent to it.
*
+ * Usage:
+ * @code
+ * $wgMWLoggerDefaultSpi = array(
+ * 'class' => 'MWLoggerNullSpi',
+ * );
+ * @endcode
+ *
* @see MWLogger
* @since 1.25
* @author Bryan Davis <bd808@wikimedia.org>