[MINOR] Tidy.

README.md

@@ -1,6 +1,6 @@
 # [extensible search](https://packagist.org/packages/nglasl/silverstripe-extensible-search)
 
-_The current release is **4.1.0**_
+_The current release is **4.1.1**_
 
 > This module allows user customisation and developer extension of a search page instance, including analytics and suggestions.
 

src/pages/ExtensibleSearchPage.php

@@ -431,11 +431,7 @@ public function getSelectableFields() {
 
 			// Determine the search engine specific selectable fields.
 
-			$fields = singleton($this->SearchEngine)->getSelectableFields($this);
-			if (!$fields) {
-				// If null or falsey type, change to array
-				$fields = [];
-			}
+			$fields = singleton($this->SearchEngine)->getSelectableFields($this) ?: array();
 			return $fields + $selectable;
 		}
 		else if(($this->SearchEngine === 'Full-Text') && is_array($classes = Config::inst()->get(FulltextSearchable::class, 'searchable_classes')) && (count($classes) > 0)) {