Fixed lack of constructor
Fixed lack of constructor

stephenmcm/silverstripe-solr,stephenmcm/silverstripe-solr,nyeholt/silverstripe-solr,nyeholt/silverstripe-solr,stephenmcm/silverstripe-solr,nyeholt/silverstripe-solr,nyeholt/silverstripe-solr,stephenmcm/silverstripe-solr