Merge pull request #36 from mwgamble/tabcontent_selector_fix

Fix check to see if supplied tab content selector worked

Author: gaykov

bootstrap-tabcollapse.js

@@ -93,7 +93,7 @@
         this.$accordion.html('');
 
         if(this.options.updateLinks) {
-            var $tabContents = $(this.options.tabContentSelector) || this.$tabs.siblings('.tab-content')
+            var $tabContents = this.getTabContentElement();
             $tabContents.find('[data-toggle-was="tab"], [data-toggle-was="pill"]').each(function() {
                 var $el = $(this);
                 var href = $el.attr('href').replace(/-collapse$/g, '');
@@ -109,6 +109,14 @@
         this.$tabs.trigger($.Event('shown-tabs.bs.tabcollapse'));
     };
 
+    TabCollapse.prototype.getTabContentElement = function(){
+        var $tabContents = $(this.options.tabContentSelector);
+        if($tabContents.length === 0) {
+            $tabContents = this.$tabs.siblings('.tab-content');
+        }
+        return $tabContents;
+    };
+
     TabCollapse.prototype.showAccordion = function(){
         this.$tabs.trigger($.Event('show-accordion.bs.tabcollapse'));
 
@@ -186,8 +194,7 @@
         this.$accordion = $('<div class="panel-group ' + this.options.accordionClass + '" id="' + accordionId +'"></div>');
         this.$tabs.after(this.$accordion);
         this.$tabs.addClass(this.options.tabsClass);
-        var $tabContents = $(this.options.tabContentSelector) || this.$tabs.siblings('.tab-content')
-        $tabContents.addClass(this.options.tabsClass);
+        this.getTabContentElement().addClass(this.options.tabsClass);
     };
 
     TabCollapse.prototype._createAccordionGroup = function(parentId, $heading){