FunctionBreakpoint behaves differently with ParamTypes of null vs an empty array

[Redth]

On mono 6.x using FunctionBreakpoint for a method with no parameters if you don't set fnBp.ParamTypes=Array.Empty<string> (); the breakevent is not fired correctly. If you explicitly set null the same thing happens. Only once you set it to an empty array does it behave as one would expect.