Martine Lenders 72db5e48f0 gnrc_ipv6_nib: fix for 'holey' NIB
When there are holes in the NIB (e.g. when entries were removed)
currently the NIB crashes the system due to a failed assertion
(`DEVELHELP` needs to be activated to test this behavior).

This fixes this behavior by making the assertion a check that is always
compiled in.
2017-11-09 15:28:56 +01:00
..
2017-11-09 15:28:56 +01:00
2017-11-09 15:28:56 +01:00