publish lessons as public always

python/educational-core/src/com/jetbrains/edu/learning/courseFormat/Lesson.java

@@ -137,6 +137,10 @@ public class Lesson implements StudyItem {
     myUpdateDate = updateDate;
   }
 
+  public void setPublic(boolean isPublic) {
+    this.is_public = isPublic;
+  }
+
   public boolean isUpToDate() {
     if (myId == 0) return true;
     final Date date = EduStepicConnector.getLessonUpdateDate(myId);

python/educational-core/src/com/jetbrains/edu/learning/stepic/StepicWrappers.java

@@ -193,6 +193,7 @@ public class StepicWrappers {
       this.lesson.setName(lesson.getName());
       this.lesson.setId(lesson.getId());
       this.lesson.steps = new ArrayList<>();
+      this.lesson.setPublic(true);
     }
   }