Fix a bug in vc-emacs where if the file had comments (cfile, e.g. as a result of a collapse) vc-bk-status was returning nil and emacs  was trying to register it.
Fix a bug in vc-emacs where if the file had comments (cfile, e.g. as
a result of a collapse) vc-bk-status was returning nil and emacs 
was trying to register it.

bk: 52093d68RBLS5JLxGJeMcMvqwfp4rA
bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper