This avoids hard-coding the '(none)' string in the JavaScript for each
style and avoids the {nonexisting|nonempty} hack which only works
since the template system don't complain about undefined variables.
At least subversion allows empty commit logs which, after conversion,
show up as empty fields in hgweb and don't allow selecting the
changeset. Using "nonempty" as filter, "(none)" is used to get
clickable links for empty commit messages.
This patch removes tables altogether for file and diff, and removes
one column from annotate, making firefox's incremental renderer much
faster for large files.
When a manifest has a series of directories with nothing in them but a single
directory, displaying the entire chain of empty directories allows for
navigation down to the first non-empty directory with a single click.
Because Java links package hierarchy to directory hierarchy, and because Java
conventions include at least three empty directories at the top of this
hierarchy, descending down empty directories is very common in Java web tools.
