During the 7.x-1.9 RC VM creation, I saw some warnings on every cache clear and module install
==> default: Invalid argument supplied for foreach() [warning]
==> default: islandora_solr_views.views.inc:94
That lines assumes that we already have some fiels in Solr while enabling and that those are accesible via Luke. Probably solr fields is undefined or not an array by the time this is installed. This would probably not affect a normal installation where people already have a working Solr config/search, but assuming blindly that this should be an array we can iterate over is also wrong.