Fix deepcopy error due to fix in 90d1317a not being applied everywhere

Other problem builder child blocks were adding themselves to the context, then calling context.copy() caused errors.

problem_builder/answer.py

@@ -165,7 +165,7 @@ class AnswerBlock(AnswerMixin, StepMixin, StudioEditableXBlockMixin, XBlock):
 
     def mentoring_view(self, context=None):
         """ Render this XBlock within a mentoring block. """
-        context = context or {}
+        context = context.copy() if context else {}
         context['self'] = self
         context['hide_header'] = context.get('hide_header', False) or not self.show_title
         html = loader.render_template('templates/html/answer_editable.html', context)
@@ -271,7 +271,7 @@ class AnswerRecapBlock(AnswerMixin, StudioEditableXBlockMixin, XBlock):
 
     def mentoring_view(self, context=None):
         """ Render this XBlock within a mentoring block. """
-        context = context or {}
+        context = context.copy() if context else {}
         context['title'] = self.display_name
         context['description'] = self.description
         context['student_input'] = self.student_input

problem_builder/step.py

@@ -95,12 +95,12 @@ class StepMixin(object):
         return self._(u"Question")
 
     def author_view(self, context):
-        context = context or {}
+        context = context.copy() if context else {}
         context['hide_header'] = True
         return self.mentoring_view(context)
 
     def author_preview_view(self, context):
-        context = context or {}
+        context = context.copy() if context else {}
         context['hide_header'] = True
         return self.student_view(context)
 

problem_builder/table.py

@@ -70,7 +70,7 @@ class MentoringTableBlock(StudioEditableXBlockMixin, StudioContainerXBlockMixin,
     has_children = True
 
     def student_view(self, context):
-        context = context or {}
+        context = context.copy() if context else {}
         fragment = Fragment()
         header_values = []
         content_values = []
@@ -136,7 +136,7 @@ class MentoringTableColumn(StudioEditableXBlockMixin, StudioContainerXBlockMixin
 
     def mentoring_view(self, context=None):
         """ Render this XBlock within a mentoring block. """
-        context = context or {}
+        context = context.copy() if context else {}
         fragment = Fragment()
         for child_id in self.children:
             child = self.runtime.get_block(child_id)