fix check for showing tabview icon

knowledge/survey/browser.py

@@ -42,7 +42,6 @@ template = ViewPageTemplateFile('view_macros.pt')
 
 class SurveyView(ConceptView):
 
-    tabview = 'index.html'
     data = None
     errors = None
 
@@ -51,6 +50,11 @@ class SurveyView(ConceptView):
         self.registerDojo()
         return template.macros['survey']
 
+    @Lazy
+    def tabview(self):
+        if self.editable:
+            return 'index.html'
+
     def results(self):
         result = []
         response = None