add empty failing case
plugin fails when minblock has no content

When there is a minblock with no content, the plugin fails to proccess it due to a replace on an undefined object.

Warning: Cannot call method 'replace' of undefined Use --force to continue.
to reproduce the problem, just set an empty min block

//-<!-- build:js /js/index.min.js -->
//-<!-- endbuild -->

FIX #16
minor
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Merge branch 'arturokunder-master'