-the tab shows an empty mirror row when no mirror is configured
-able to delete the mirror row even if it's not empty(if it's not
the first mirror)
[YOCTO #3189]
(Bitbake rev: d6472608112b8af2e98f247e6f89a7f948b2d020)
Signed-off-by: Cristiana Voicu <cristiana.voicu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>