Ensure that `WP_Date_Query` accepts a value of `0` for 'hour'.

Props jim912.
Fixes #34228.
Built from https://develop.svn.wordpress.org/trunk@34989


git-svn-id: http://core.svn.wordpress.org/trunk@34954 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/date.php

@@ -992,7 +992,7 @@ class WP_Date_Query {
 		$format = $time = '';
 
 		// Hour
-		if ( $hour ) {
+		if ( null !== $hour ) {
 			$format .= '%H.';
 			$time   .= sprintf( '%02d', $hour ) . '.';
 		} else {

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34988';
+$wp_version = '4.4-alpha-34989';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.