Fix - Settings API - allow multiselect fields to be emptied.

Closes #7542

includes/abstracts/abstract-wc-settings-api.php

@@ -922,10 +922,10 @@ abstract class WC_Settings_API {
 	 */
 	public function validate_multiselect_field( $key ) {
 
-		$value = $this->get_option( $key );
-
 		if ( isset( $_POST[ $this->plugin_id . $this->id . '_' . $key ] ) ) {
 			$value = array_map( 'wc_clean', array_map( 'stripslashes', (array) $_POST[ $this->plugin_id . $this->id . '_' . $key ] ) );
+		} else {
+			$value = '';
 		}
 
 		return $value;

readme.txt

@@ -138,6 +138,7 @@ Yes you can! Join in on our [GitHub repository](http://github.com/woothemes/wooc
 
 == Changelog ==
 
+* Fix - Settings API - allow multiselect fields to be emptied.
 * Fix - Saving an order needs to save the discount amount ex. tax like the cart.
 * Tweak - Show discounts inc. tax when showing order totals inc. tax.
 * Tweak - Use 30 days instead of year for transients to avoid bugs in memcache plugins.