conditional xmod: add errortracker msg and inherit icon from child

common/lib/xmodule/xmodule/conditional_module.py

@@ -44,6 +44,10 @@ class ConditionalModule(XModule):
         XModule.__init__(self, system, location, definition, descriptor, instance_state, shared_state, **kwargs)
         self.contents = None
         self.condition = self.metadata.get('condition','')
+        self._get_required_modules()
+        children = self.get_display_items()
+        if children:
+            self.icon_class = children[0].get_icon_class()
         #log.debug('conditional module required=%s' % self.required_modules_list)
 
     def _get_required_modules(self):
@@ -127,7 +131,14 @@ class ConditionalDescriptor(SequenceDescriptor):
 
         required_module_list = [tuple(x.split('/',1)) for x in self.metadata.get('required','').split('&')]
         self.required_module_locations = []
-        for (tag, name) in required_module_list:
+        for rm in required_module_list:
+            try:
+                (tag, name) = rm
+            except Exception as err:
+                msg = "Specification of required module in conditional is broken: %s" % self.metadata.get('required')
+                log.warning(msg)
+                self.system.error_tracker(msg)
+                continue
             loc = self.location.dict()
             loc['category'] = tag
             loc['name'] = name