Short-circuit insertEnd() if we're at the beginning of the file.
Short-circuit insertEnd() if we're at the beginning of the file.

git-svn-id: https://svn.sable.mcgill.ca/mclab/Project@573 89b902b4-d83f-0410-b942-89f7a419ffdb

Migrated from Sable/mclab@b0e9728ffb86db3e13b94e084219f37fb99d8d8c

Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core