Studio view?

concept/concept.py

-"""TO-DO: Write a description of what this XBlock is."""
+"""This XBlock allows students to edit a concept map. Why students? We
+can integrate with the LMS more easily than with Studio, so it's in
+many ways an easier environment where to do this."""
 
 import pkg_resources
 
@@ -14,8 +16,6 @@ class ConceptXBlock(XBlock):
     This XBlock allows concept tagging in a course. 
     """
 
-    # Fields are defined on the class.  You can access them in your code as
-    # self.<fieldname>.
     server = String(
            scope = Scope.settings, 
            help = "Concept map server URL"
@@ -28,17 +28,13 @@ class ConceptXBlock(XBlock):
 
     @XBlock.json_handler
     def update_concept_map(self, request, suffix):
-        print request
         self.concept_map = json.dumps(request)
-        print "Wrote:", self.concept_map
         return {'success':True}
 
     @XBlock.json_handler
     def relay_handler(self, request, suffix):
-        #print request, type(request), dict(request)
         url = self.server+request['suffix']
         r = requests.get(url, params=request) 
-        #print url,":", r.text[:80]
         return json.loads(r.text)
 
     def resource_string(self, path):
@@ -46,32 +42,30 @@ class ConceptXBlock(XBlock):
         data = pkg_resources.resource_string(__name__, path)
         return data.decode("utf8")
 
-    # TO-DO: change this view to display your data your own way.
     def student_view(self, context=None):
         """
         The primary view of the ConceptXBlock, shown to students
         when viewing courses.
         """
-        print "HERE", self.concept_map
         html = self.resource_string("static/html/concept.html")#.replace("PLACEHOLDER_FOR_CONCEPT_MAP",json.dumps(self.concept_map))
-        #print self.server
-        #print html.format
         cm = self.concept_map
-        print "Read", cm
-        frag = Fragment(html.replace("PLACEHOLDER_FOR_CONCEPT_MAP",cm).replace("SERVER", self.server))   #)#format(server = self.server, concept_map = cm))
+        if not cm:
+            cm = '{"required":[], "taught":[], "exercised":[]}'
+        frag = Fragment(html.replace("PLACEHOLDER_FOR_CONCEPT_MAP",cm).replace("SERVER", self.server))
         frag.add_css_url("https://ajax.googleapis.com/ajax/libs/jqueryui/1.10.4/themes/smoothness/jquery-ui.css")
         frag.add_css(self.resource_string("static/css/concept.css"))
 
         frag.add_javascript_url("http://builds.handlebarsjs.com.s3.amazonaws.com/handlebars-v1.3.0.js")
-#        frag.add_javascript_url("https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js")
         frag.add_javascript_url("https://ajax.googleapis.com/ajax/libs/jqueryui/1.10.4/jquery-ui.min.js")
 
         frag.add_javascript(self.resource_string("static/js/concept.js"))
 
         frag.initialize_js('ConceptXBlock')
-        print self.xml_text_content()
         return frag
 
+    def studio_view(self, context=None):
+        return ""
+
     # TO-DO: change this to create the scenarios you'd like to see in the
     # workbench while developing your XBlock.
     @staticmethod