From 86bb873fed68438d6a09c6a1d865ae84fb3dfb4e Mon Sep 17 00:00:00 2001
From: Allan Jardine <allan@stargazer>
Date: Tue, 6 Nov 2018 09:53:04 +0000
Subject: [PATCH] Sorting: Allow the brackets-negative to work with an empty
 string (i.e. it being 0)

Thanks @unclethehornet
---
 sorting/brackets-negative.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sorting/brackets-negative.js b/sorting/brackets-negative.js
index 0559aa0..b6b44c0 100644
--- a/sorting/brackets-negative.js
+++ b/sorting/brackets-negative.js
@@ -25,6 +25,10 @@
 		}
 	);
 	$.fn.dataTable.ext.type.order['currency-pre'] = function ( data ) {
+		if ( data === '' ) {
+			return 0;
+		}
+
 		//Check if its in the proper format
 		if(data.match(/[\()]/g)){
 			if( data.match(/[\-]/g) !== true){