Import fixes necessary for client-only builds

Packages/viewerbase/lib/viewportFunctions.js

@@ -1,3 +1,5 @@
+import { OHIF } from 'meteor/ohif:core';
+
 getActiveViewportElement = function() {
     var viewportIndex = Session.get("activeViewport") || 0;
     return $('.imageViewerViewport').get(viewportIndex);