From ec333118d3b3700ef6cf63ae0a3449d758d44cd6 Mon Sep 17 00:00:00 2001
From: Leonardo Campos <leonardoscampos@gmail.com>
Date: Wed, 3 May 2017 20:23:13 -0300
Subject: [PATCH] OHIF-56: Missing button to go back to worklist from an open
 study

---
 .../client/components/ohifViewer/ohifViewer.js      | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/OHIFViewer/client/components/ohifViewer/ohifViewer.js b/OHIFViewer/client/components/ohifViewer/ohifViewer.js
index 860b6dd0d..6806cff8d 100644
--- a/OHIFViewer/client/components/ohifViewer/ohifViewer.js
+++ b/OHIFViewer/client/components/ohifViewer/ohifViewer.js
@@ -45,18 +45,23 @@ Template.ohifViewer.events({
             Router.go('studylist');
         } else {
             const { studyInstanceUids } = OHIF.viewer.data;
-            Router.go('viewerStudies', { studyInstanceUids });
+            if (studyInstanceUids) {
+                Router.go('viewerStudies', { studyInstanceUids });
+            }
         }
     }
 });
 
 Template.ohifViewer.helpers({
     studyListToggleText() {
+        const instance = Template.instance();
         const isViewer = Session.get('ViewerOpened');
 
-        // Return empty if viewer was not opened yet
-        if (!OHIF.utils.ObjectPath.get(OHIF, 'viewer.data.studyInstanceUids')) return;
+        if (isViewer) {
+            instance.hasViewerData = true;
+            return 'Study list';
+        }
 
-        return isViewer ? 'Study list' : 'Back to viewer';
+        return instance.hasViewerData ? 'Back to viewer' : '';
     }
 });