Fix error in rendering when we are rendering a lesson plan with no virtual milestones
Fix error in rendering when we are rendering a lesson plan with no virtual milestones

nusedutech/coursemology.org,allenwq/coursemology.org,allenwq/coursemology.org,nusedutech/coursemology.org,dariusf/coursemology.org,nnamon/coursemology.org,nnamon/coursemology.org,dariusf/coursemology.org,dariusf/coursemology.org,nusedutech/coursemology.org,nusedutech/coursemology.org,allenwq/coursemology.org,nusedutech/coursemology.org,nnamon/coursemology.org,nnamon/coursemology.org,Coursemology/coursemology.org,Coursemology/coursemology.org,allenwq/coursemology.org,Coursemology/coursemology.org,nnamon/coursemology.org,allenwq/coursemology.org,dariusf/coursemology.org,Coursemology/coursemology.org,dariusf/coursemology.org,Coursemology/coursemology.org