If the user runs the blame viewer on a working directory file
instead of a specific commit-ish then we have no value for the
commit SHA1 or the summary line; this causes the history menu
to get an empty entry at the very bottom. We now look for this
odd case and call the meny entry "Working Directory".
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
if {[regexp {^[0-9a-f]{40}$} $c]} {
set t [string range $c 0 8]...
+ } elseif {$c eq {}} {
+ set t {Working Directory}
} else {
set t $c
}