modules/admin-core: prevent crash in network interface overview when netmask option is defined, but empty
modules/admin-core: prevent crash in network interface overview when netmask option is defined, but empty


git-svn-id: f7818b41aa164576329f806d7c3827e8a55298bb@4166 ab181a69-ba2e-0410-a84d-ff88ab4c47bc

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