enable and visible for edu actions

python/educational/interactive-learning/src/com/jetbrains/edu/learning/StudyUtils.java

@@ -116,7 +116,7 @@ public class StudyUtils {
     if (project != null) {
       final StudyEditor studyEditor = getSelectedStudyEditor(project);
       if (studyEditor != null) {
-        presentation.setEnabled(true);
+        presentation.setEnabledAndVisible(true);
       }
     }
   }