Fix Exception - Attempt to modify property "data" on null.

tests/behat/view_report.feature

@@ -0,0 +1,49 @@
+@mod @mod_questionnaire
+Feature: Questionnaire reports can be accessed
+  In order to view a questionnaire report
+  As a teacher
+  I need to be able to see the report.
+
+  @javascript
+  Scenario: Add a questionnaire and then fill it and then view thereport
+    Given the following "users" exist:
+      | username | firstname | lastname | email                |
+      | teacher1 | Teacher   | 1        | teacher1@example.com |
+      | student1 | Student   | 1        | student1@example.com |
+    And the following "courses" exist:
+      | fullname | shortname | category |
+      | Course 1 | C1        | 0        |
+    And the following "course enrolments" exist:
+      | user     | course | role           |
+      | teacher1 | C1     | editingteacher |
+      | student1 | C1     | student        |
+    And the following "activities" exist:
+      | activity      | name               | description                    | course | idnumber       |
+      | questionnaire | Test questionnaire | Test questionnaire description | C1     | questionnaire0 |
+    And I log in as "teacher1"
+    And I am on "Course 1" course homepage
+    And I follow "Test questionnaire"
+    And I navigate to "Questions" in current page administration
+    And I add a "Yes/No" question and I fill the form with:
+      | Question Name | Q1 |
+      | Yes | y |
+      | Question Text | Are you still in School? |
+    Then I should see "[Yes/No] (Q1)"
+    And I navigate to "Feedback" in current page administration
+    And I set the field "Feedback options" to "Feedback sections"
+    And I press "Save settings"
+    And I log out
+    And I log in as "student1"
+    And I am on "Course 1" course homepage
+    And I follow "Test questionnaire"
+    And I navigate to "Answer the questions..." in current page administration
+    And I click on "Yes" "radio"
+    And I press "Submit questionnaire"
+    Then I should see "Thank you for completing this Questionnaire."
+    And I press "Continue"
+    And I log out
+    And I log in as "teacher1"
+    And I am on "Course 1" course homepage
+    And I follow "Test questionnaire"
+    Then I should see "View all responses"
+    And I navigate to "Feedback" in current page administration