LT-239: Handle the error if the last imported file is not dcm file

- Add message label in progress dialog

OHIFViewer/defaultSettings.js

@@ -31,7 +31,7 @@ Meteor.startup(function() {
         defaultServiceType: 'dicomWeb',
         public: {
             ui: {
-                studyListFunctionsEnabled: false
+                studyListFunctionsEnabled: true
             }
         }
         //defaultServiceType: 'dimse'