If remove() is called with an empty package list, ensure we do nothing instead
of calling the underlying package manager with an invalid command line.
[ YOCTO #12900 ]
(From OE-Core rev: 715ec20c433cb4ed5fde938c33a42b2a296e4e56)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>