Fix: error checking for incompatible variables create_role and lambda_role #604
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Description
There is an undocumented conflict between create_role and lambda_role. The latter is completely ignored if the former is set to true, and instead either the role_name variable or the function name is used. This creates confusing behavior for users, and is exacerbated because it will fail silently. This error checking tests whether create_role is true, and passes if it is false or if it is true but lambda_role is empty.