FullyQualifiedTopicNames are of the from <namespace>.<topicname> but only the TopicName portion is rendered in the page. If the TopicName does not exist then it is rendered as a clickable link goes straight to the edit page for creating that topic. When the namespace does not exist this caused an unhandled exception in the source code.

To fix this problem and to allow code to be written more easily (such as System.StringBuilder) this bug has now been fixed. The solution is to ignore TopicNames if the namespace does not exist.