MDL-54116 block_comments: warnings when commenting outside of a course

blocks/comments/tests/behat/block_comment_dashboard.feature

@@ -4,16 +4,26 @@ Feature: Enable Block comments on the dashboard and view comments
   As a teacher
   I can add the comments block to my dashboard
 
-  Scenario: Add the comments block on the dashboard and add comments
+  Background:
     Given the following "courses" exist:
       | fullname | shortname | category |
       | Course 1 | C1 | 0 |
     And the following "users" exist:
       | username | firstname | lastname | email |
       | teacher1 | Teacher | Frist | teacher1@example.com |
-    And I log in as "teacher1"
+
+  Scenario: Add the comments block on the dashboard and add comments with Javascript disabled
+    When I log in as "teacher1"
     And I press "Customise this page"
-    And I add the "Comment" block
+    And I add the "Comments" block
     And I follow "Show comments"
-    When I add "I'm a comment from the teacher" comment to comments block
+    And I add "I'm a comment from the teacher" comment to comments block
+    Then I should see "I'm a comment from the teacher"
+
+  @javascript
+  Scenario: Add the comments block on the dashboard and add comments with Javascript enabled
+    When I log in as "teacher1"
+    And I press "Customise this page"
+    And I add the "Comments" block
+    And I add "I'm a comment from the teacher" comment to comments block
     Then I should see "I'm a comment from the teacher"

comment/comment_post.php

@@ -34,6 +34,11 @@
 require_login($course, true, $cm);
 require_sesskey();
 
+if (!$course) {
+    // Require_login() does not set context if called without a $course, do it manually.
+    $PAGE->set_context($context);
+}
+
 $action    = optional_param('action',    '',  PARAM_ALPHA);
 $area      = optional_param('area',      '',  PARAM_AREA);
 $content   = optional_param('content',   '',  PARAM_RAW);
@@ -48,7 +53,9 @@
 
 $cmt = new stdClass;
 $cmt->contextid = $contextid;
-$cmt->courseid  = $course->id;
+if ($course) {
+    $cmt->courseid = $course->id;
+}
 $cmt->cm        = $cm;
 $cmt->area      = $area;
 $cmt->itemid    = $itemid;