redirect_to doesn't return - fixes DoubleRenderError

Author: Josh Lory

dashboard/app/controllers/plc/user_course_enrollments_controller.rb

@@ -29,7 +29,10 @@ def new
   # POST /plc/user_course_enrollments.json
   def create
     user = User.find_by_email_or_hashed_email(user_course_enrollment_params[:user_email])
-    redirect_to action: :new if user.nil?
+    if user.nil?
+      redirect_to action: :new
+      return
+    end
 
     @user_course_enrollment = Plc::UserCourseEnrollment.find_or_create_by(user: user,
                                                                      plc_course_id: user_course_enrollment_params[:plc_course_id])