xbps_array_foreach_cb: replace an assertion with a real test, for non working repos.
xbps_array_foreach_cb: replace an assertion with a real test, for non working repos.

stpx/xbps,datenwolf/xbps,ebfe/xbps,stpx/xbps,datenwolf/xbps,datenwolf/xbps,ebfe/xbps,stpx/xbps,ebfe/xbps