1.1.4dev: Omit link to previous version of page if it doesn't exist. Refs #11725.
1.1.4dev: Omit link to previous version of page if it doesn't exist. Refs #11725.


git-svn-id: 0d96b0c1a6983ccc08b3732614f4d6bfcf9cbb42@13698 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac