docs: fix bug with unknown anchors

Change-Id: I70f978ffd2248973a43ff1fe1dec2b0ac78cb63b
diff --git a/docs/html/about/versions/jelly-bean.jd b/docs/html/about/versions/jelly-bean.jd
index 1e21e0f..2680100 100644
--- a/docs/html/about/versions/jelly-bean.jd
+++ b/docs/html/about/versions/jelly-bean.jd
@@ -42,8 +42,13 @@
     link = $("#version-tabs a[href$="+sectionId+"]");
     link.parent().addClass("selected");
     link.parent().siblings().removeClass("selected");
-    $(".version-section").hide();
-    $(link.attr("href")).show();
+    
+    sectionDiv = $(".version-section"+link.attr("href"));
+    if (sectionDiv.length) {
+      $(".version-section").hide();
+      sectionDiv.show();
+    }
+    
     $('html, body').animate({
          scrollTop: $(hashy).offset().top
      }, 100);