Revert "[O] Make gradedCourses a getter instead of a field"

This reverts commit cc046010ff.

src/components/app/app.ts

@@ -59,11 +59,6 @@ export default class App extends Vue
     // Is the login panel shown
     showLogin: boolean = !this.demoMode
 
-    get gradedCourses()
-    {
-        return this.courses.filter(course => course.isGraded);
-    }
-
     /**
      * This is called when the instance is created.
      */
@@ -143,7 +138,14 @@ export default class App extends Vue
         });
 
         // Wait for assignments to be ready.
-        pWaitFor(() => this.courses.every(c => c.rawAssignments != null)).then(this.checkGradingAlgorithms);
+        pWaitFor(() => this.courses.every(c => c.rawAssignments != null)).then(() =>
+        {
+            // Filter courses
+            this.gradedCourses = this.courses.filter(c => c.isGraded);
+
+            // Check grading algorithms
+            this.checkGradingAlgorithms();
+        });
     }
 
     /**