General: Return "O B" when passing 0 to `size_format()`.

Props swissspidy.
Fixes #36635.
Built from https://develop.svn.wordpress.org/trunk@37962


git-svn-id: http://core.svn.wordpress.org/trunk@37903 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.php

@@ -263,6 +263,10 @@ function size_format( $bytes, $decimals = 0 ) {
 		'B'  => 1,
 	);
 
+	if ( 0 === $bytes ) {
+		return number_format_i18n( 0, $decimals ) . ' B';
+	}
+
 	foreach ( $quant as $unit => $mag ) {
 		if ( doubleval( $bytes ) >= $mag ) {
 			return number_format_i18n( $bytes / $mag, $decimals ) . ' ' . $unit;

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-beta1-37961';
+$wp_version = '4.6-beta1-37962';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.