make consistent with ODEProblem def

Author: isaacsas

src/systems/diffeqs/sdesystem.jl

@@ -168,7 +168,7 @@ function DiffEqBase.SDEProblem{iip}(sys::SDESystem,u0map,tspan,p=parammap;
 Generates an SDEProblem from an SDESystem and allows for automatically
 symbolically calculating numerical enhancements.
 """
-function DiffEqBase.SDEProblem{iip}(sys::SDESystem,u0map,tspan,parammap;
+function DiffEqBase.SDEProblem{iip}(sys::SDESystem,u0map,tspan,parammap=DiffEqBase.NullParameters();
                                     version = nothing, tgrad=false,
                                     jac = false, Wfact = false,
                                     checkbounds = false, sparse = false,