Fix: null handling for type detection and filtering methods

- The built in filtering formatters and type detection need to be able
  to handle just about any data being passed into them. They were
  tripping up with null data being passed in before.

.datatables-commit-sync

@@ -1 +1 @@
-ad75f1d054a77eac282189e742c0e5167946ac04
+bef23129b8047b26e86b2aa75ed213132bd691c0

media/js/jquery.dataTables.js

@@ -13662,6 +13662,10 @@
 	};
 	
 	var _htmlNumeric = function ( d, formatted ) {
+		if ( _empty( d ) ) {
+			return true;
+		}
+	
 		var html = _isHtml( d );
 		return ! html ?
 			null :
@@ -13723,17 +13727,21 @@
 	
 	$.extend( DataTable.ext.type.filter, {
 		html: function ( data ) {
-			return typeof data === 'string' ?
-				data
-					.replace( __filter_lines, " " )
-					.replace( __filter_html, "" ) :
-				'';
+			return _empty(data) ?
+				'' :
+				typeof data === 'string' ?
+					data
+						.replace( __filter_lines, " " )
+						.replace( __filter_html, "" ) :
+					'';
 		},
 	
 		string: function ( data ) {
-			return typeof data === 'string' ?
-				data.replace( __filter_lines, " " ) :
-				data;
+			return _empty(data) ?
+				'' :
+				typeof data === 'string' ?
+					data.replace( __filter_lines, " " ) :
+					data;
 		}
 	} );