Here is a link to Ohio Revised Code Chapter 5311, the chapter on condominiums. Section 5311.16 says that the board of directors shall provide certain kinds of insurance for all unit owners "unless otherwise provided by the declaration or bylaws."
So go and read the declaration and bylaws to see what they say about insurance. If the declaration and bylaws do not exempt your condo association's board of directors (you HAVE a board of directors, right?) from this requirement to buy insurance covering all the owners and has not done so, you can sue them to try to make them do it.
If the declaration and/or bylaws do exempt the board of directors from having to cover all the unit owners as described in ORC 5311.16, then you could try investigating the history of those documents to see whether the wording that exempts them from this requirement was added at some time using an improper process.
Meantime, you could also certainly research (1) what insurance lenders might typically require before being willing to fund a mortgage loan on your condo and (2) whether insurers exist who would be willing to let you or your would-be buyers buy the lender-required insurance yourselves. Research question (1) by asking some of the biggest mortgage lenders in your area, plus also any bank or banks where you are currently a valued customer of one kind or another. Research (2) by calling insurers who write condo unitowners' policies.
If all of the above research fails to get you out of this jam, you may be forced to advertise the condo as being available to cash buyers only. I have seen properties so advertised, so yours would not be the only one. It would certainly reduce the price you'd be likely to get for it, but you wouldn't waste your time getting into contract repeatedly only to have the deals fall through.
And no, I don't think you can win a lawsuit against your lender for giving you a loan that other lenders wouldn't have given you!