Remove trailing space after some commands

[aureliojargas]

Sedsed is adding one extra trailing space after commands that usually have an argument, but sometimes doesn't. For example, b label can also be just b with no label. In that case, the extra space is added after b:

$ sedsed -e 5b | cat -A
5 b $
$ sedsed -e 5b -H | grep 5 | cat -A
<font color="#8080ff"><b>5</b></font> <font color="#ffff00"><b>b</b></font> $
$

Please, no useless trailing spaces.