update templates to include attemps and weight values. Also update…

update templates to include attemps and weight values. Also update capa_module.py to accept empty strings ('') to mean 'default value'

common/lib/xmodule/xmodule/capa_module.py

@@ -116,9 +116,11 @@ class CapaModule(XModule):
             self.grace_period = None
             self.close_date = self.display_due_date
 
-        self.max_attempts = self.metadata.get('attempts', None)
-        if self.max_attempts is not None:
-            self.max_attempts = int(self.max_attempts)
+        max_attempts = self.metadata.get('attempts', None)
+        if max_attempts:
+            self.max_attempts = int(max_attempts)
+        else:
+            self.max_attempts = None
 
         self.show_answer = self.metadata.get('showanswer', 'closed')
 

common/lib/xmodule/xmodule/templates/problem/circuitschematic.yaml

@@ -3,6 +3,8 @@ metadata:
     display_name: Circuit Schematic
     rerandomize: never
     showanswer: always
+    weight: ""
+    attempts: ""
 data: |
   <problem >
     Please make a voltage divider that splits the provided voltage evenly.

common/lib/xmodule/xmodule/templates/problem/customgrader.yaml

@@ -3,6 +3,8 @@ metadata:
     display_name: Custom Grader
     rerandomize: never
     showanswer: always
+    weight: ""
+    attempts: ""
 data: |
   <problem>
   <p>

common/lib/xmodule/xmodule/templates/problem/empty.yaml

@@ -4,6 +4,8 @@ metadata:
     rerandomize: never
     showanswer: always
     markdown: ""
+    weight: ""
+    attempts: ""
 data: |
   <problem>
   </problem>

common/lib/xmodule/xmodule/templates/problem/forumularesponse.yaml

@@ -3,6 +3,8 @@ metadata:
     display_name: Formula Response
     rerandomize: never
     showanswer: always
+    weight: ""
+    attempts: ""
 data: |
   <problem>
   <p>

common/lib/xmodule/xmodule/templates/problem/imageresponse.yaml

@@ -3,6 +3,8 @@ metadata:
     display_name: Image Response
     rerandomize: never
     showanswer: always
+    weight: ""
+    attempts: ""
 data: |
   <problem>
   <p>

common/lib/xmodule/xmodule/templates/problem/multiplechoice.yaml

@@ -3,6 +3,8 @@ metadata:
     display_name: Multiple Choice
     rerandomize: never
     showanswer: always
+    weight: ""
+    attempts: ""
     markdown: 
        "A multiple choice problem presents radio buttons for student input. Students can only select a single 
        option presented. Multiple Choice questions have been the subject of many areas of research due to the early 

common/lib/xmodule/xmodule/templates/problem/numericalresponse.yaml

@@ -3,6 +3,8 @@ metadata:
     display_name: Numerical Response
     rerandomize: never
     showanswer: always
+    weight: ""
+    attempts: ""
     markdown: 
        "A numerical response problem accepts a line of text input from the
        student, and evaluates the input for correctness based on its

common/lib/xmodule/xmodule/templates/problem/optionresponse.yaml

@@ -3,6 +3,8 @@ metadata:
     display_name: Option Response
     rerandomize: never
     showanswer: always
+    weight: ""
+    attempts: ""
     markdown: 
         "OptionResponse gives a limited set of options for students to respond with, and presents those options
         in a format that encourages them to search for a specific answer rather than being immediately presented 

common/lib/xmodule/xmodule/templates/problem/string_response.yaml

@@ -3,6 +3,8 @@ metadata:
     display_name: String Response
     rerandomize: never
     showanswer: always
+    weight: ""
+    attempts: ""
     # Note, the extra newlines are needed to make the yaml parser add blank lines instead of folding
     markdown: 
         "A string response problem accepts a line of text input from the