no scroll handler, wenn no shift calendar

public/js/shift-calendar.js

@@ -1,30 +0,0 @@
-/**
- * Enables the fixed headers and time lane for the shift-calendar.
- */
-$(document).ready(
-    function() {
-      var timeLanes = $(".shift-calendar .time");
-      var headers = $(".shift-calendar .header");
-      var topReference = $(".container-fluid .row");
-      var top = headers.offset().top;
-      var left = 15;
-      timeLanes.css({
-        "position" : "relative",
-        "z-index" : 999
-      });
-      headers.css({
-        "position" : "relative",
-        "z-index" : 900
-      });
-      $(window).scroll(
-          function() {
-            timeLanes.css({
-              "left" : Math.max(0, $(window).scrollLeft() - left) + "px"
-            });
-            headers.css({
-              "top" : Math.max(0, $(window).scrollTop() - top
-                  + topReference.offset().top)
-                  + "px"
-            });
-          });
-    });

public/js/sticky-headers.js

@@ -0,0 +1,32 @@
+/**
+ * Enables the fixed headers and time lane for the shift-calendar and datatables
+ */
+$(document).ready(
+    function() {
+      if ($(".shift-calendar").length) {
+        var timeLanes = $(".shift-calendar .time");
+        var headers = $(".shift-calendar .header");
+        var topReference = $(".container-fluid .row");
+        var top = headers.offset().top;
+        var left = 15;
+        timeLanes.css({
+          "position" : "relative",
+          "z-index" : 999
+        });
+        headers.css({
+          "position" : "relative",
+          "z-index" : 900
+        });
+        $(window).scroll(
+            function() {
+              timeLanes.css({
+                "left" : Math.max(0, $(window).scrollLeft() - left) + "px"
+              });
+              headers.css({
+                "top" : Math.max(0, $(window).scrollTop() - top
+                    + topReference.offset().top)
+                    + "px"
+              });
+            });
+      }
+    });

templates/layout.html

@@ -48,6 +48,6 @@
 			});
 		</script>
   <script type="text/javascript" src="js/moment-countdown.js"></script>
-  <script type="text/javascript" src="js/shift-calendar.js"></script>
+  <script type="text/javascript" src="js/sticky-headers.js"></script>
 </body>
 </html>