Fix: Styles which used multiple classes on the "Add condition" button…

… (e.g. Bootstrap 4) wouldn't launch the builder immediately in a button collection.

https://datatables.net/forums/discussion/71515/show-searchbuilder-form#latest

src/index.ts

@@ -97,12 +97,15 @@ import SearchBuilder, {setJQuery as searchBuilderJQuery} from './searchBuilder';
 				align: 'container',
 				span: 'container'
 			});
+
+			let topGroup = config._searchBuilder.s.topGroup;
+
 			// Need to redraw the contents to calculate the correct positions for the elements
-			if (config._searchBuilder.s.topGroup !== undefined) {
-				config._searchBuilder.s.topGroup.dom.container.trigger('dtsb-redrawContents');
+			if (topGroup !== undefined) {
+				topGroup.dom.container.trigger('dtsb-redrawContents');
 			}
-			if (config._searchBuilder.s.topGroup.s.criteria.length === 0) {
-				$('.'+($.fn as any).dataTable.Group.classes.add).click();
+			if (topGroup.s.criteria.length === 0) {
+				$('.'+($.fn as any).dataTable.Group.classes.add.replace(/ /g, '.')).click();
 			}
 		},
 		config: {},