You should have requested a landlord's insurance and not an insurance excluding contents because the property was being rented.
+1
I would have thought that most LL's when insuring their properties would ask for Landlord's Insurance. I always have done and others in
this thread from 2011 are also aware of the need for special insurance.
In the context of insurance, the term "buildings" includes your home, fixtures and fittings (kitchen units, radiators, bath, light fittings etc), garages, sheds, conservatories, patios, terraces, footpaths, drives, walls, fences and gates.
Contents Insurance covers the contents of your home, including anything you would/could take with you if you were moving house.
So even if you are renting unfurnished, you will still need contents cover for your carpets, curtains, applicances, etc.
I got back to my existing insurer and asked if they could improve the quote, they offered me a slightly smaller quote still buildings cover only no contents cover. Then I asked did this include public liability. The woman told me that it did.
I asked her to double check as another insurer had told me that that PL goes with contents cover. Again she told me that PL was included. Again I asked her to double check.
I would be inclined to report this error to the Insurer as if something had happened to your property or persons visiting / tenants, you would have got a nasty surprise.