Fix intel1g selftest
Fix intel1g selftest

Skip selftest if SNABB_PCI_INTEL1G0 is empty.

wingo/snabb,dpino/snabbswitch,mixflowtech/logsensor,snabbco/snabb,alexandergall/snabbswitch,snabbco/snabb,snabbco/snabb,wingo/snabb,snabbco/snabb,snabbco/snabb,Igalia/snabbswitch,mixflowtech/logsensor,dpino/snabb,eugeneia/snabbswitch,Igalia/snabb,SnabbCo/snabbswitch,Igalia/snabb,Igalia/snabb,dpino/snabb,heryii/snabb,dpino/snabbswitch,eugeneia/snabb,dpino/snabbswitch,wingo/snabbswitch,snabbco/snabb,dpino/snabb,SnabbCo/snabbswitch,wingo/snabb,mixflowtech/logsensor,eugeneia/snabb,Igalia/snabbswitch,alexandergall/snabbswitch,dpino/snabb,dpino/snabbswitch,dpino/snabb,kbara/snabb,dpino/snabb,eugeneia/snabbswitch,eugeneia/snabb,kbara/snabb,kbara/snabb,Igalia/snabbswitch,Igalia/snabb,heryii/snabb,heryii/snabb,Igalia/snabb,mixflowtech/logsensor,alexandergall/snabbswitch,snabbco/snabb,heryii/snabb,Igalia/snabbswitch,SnabbCo/snabbswitch,alexandergall/snabbswitch,snabbco/snabb,Igalia/snabbswitch,Igalia/snabb,dpino/snabb,Igalia/snabb,Igalia/snabb,heryii/snabb,heryii/snabb,SnabbCo/snabbswitch,alexandergall/snabbswitch,kbara/snabb,alexandergall/snabbswitch,wingo/snabb,wingo/snabb,eugeneia/snabb,wingo/snabbswitch,kbara/snabb,alexandergall/snabbswitch,wingo/snabbswitch,eugeneia/snabb,eugeneia/snabbswitch,kbara/snabb,eugeneia/snabb,wingo/snabb,alexandergall/snabbswitch,eugeneia/snabb,mixflowtech/logsensor,wingo/snabbswitch,eugeneia/snabbswitch,eugeneia/snabb