[fix] set vars only if there sources are set, fix #47 of aksw/site

AKSW / site.ontowiki

HTML Content Publishing system on top of Linked Data

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Closed haschek closed 9 years ago

haschek commented 9 years ago

This revision fix rev d4e88306256befe6daaaa2defad4a2a17521bb6b and closes issue #47.