zee: don't crash without `-e`.

* zee/main.lua (main): Continue even without `-e` options.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
zee: remove ansicolors from init.

* zee/init.lua.in (colors): Don't require ansicolors, it's not
used and not in rockspec dependencies list.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
search.lua: minor simplification and remove unused variable