_list: Add in an extra filter to remove empty lines.

The rewrite of ls functionality may have allowed blank but numbered
lines to creep into the ls display.  Search for such lines and
exclude them.

Signed-off-by: Emil Sit <sit@emilsit.net>

Signed-off-by: Gina Trapani <ginatrapani@gmail.com>

todo.sh

@@ -407,6 +407,7 @@ _list() {
     command=$(
         sed = "$src"                                            \
         | sed "N; s/^/     /; s/ *\(.\{$PADDING,\}\)\n/\1 /"    \
+	| grep -v "^[0-9]\+ *$"                                   \
         | eval ${filter_command:-cat}                           \
         | sed '''
             s/^     /00000/;