remove unnecessary Base.isfinite definitions, because it is already defined for AbstractMPO

Author: AFeuerpfeil

src/operators/mpo.jl

@@ -16,7 +16,6 @@ end
 Matrix Product Operator (MPO) acting on a finite tensor product space with a linear order.
 """
 const FiniteMPO{O} = MPO{O, Vector{O}}
-Base.isfinite(O::MPO) = isfinite(typeof(O))
 Base.isfinite(::Type{<:FiniteMPO}) = true
 GeometryStyle(::Type{<:FiniteMPO}) = FiniteChainStyle()
 OperatorStyle(::Type{<:MPO}) = MPOStyle()

src/operators/mpohamiltonian.jl

@@ -31,7 +31,6 @@ operators in a form that is compatible with this constructor.
 struct MPOHamiltonian{TO <: JordanMPOTensor, V <: AbstractVector{TO}} <: AbstractMPO{TO}
     W::V
 end
-Base.isfinite(mpo::MPOHamiltonian) = isfinite(typeof(mpo))
 OperatorStyle(::Type{<:MPOHamiltonian}) = HamiltonianStyle()
 
 const FiniteMPOHamiltonian{O <: MPOTensor} = MPOHamiltonian{O, Vector{O}}