ipv6 + static mapping + DUID typo = no working mapping anymore

[Story 0]

Hi,

If you use dhcpv6 server with several static mapping in working state, then add a new static mapping with DUID containing a typo like :

78:9A:0B:DC:12:34-56:78:90:6EBF:AB:CD:EF:12:34

Then no mapping work anymore, reload clients (up/down), no more ipv6 informations received.
I think it's a bug and i reproduced twice.

Just to say

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