iptables: abort on empty interface specification

Fiedler Roman brings to attention that if, in a faulty script,
"$some_variable" expands to an empty string, iptables should probably
catch this most likely undesired invocation. If no/all interfaces were
really desired, one can either omit -i completely, or use -i +.

References: http://marc.info/?l=netfilter&m=129439862903487&w=2
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

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