fix norm with NaN

Author: ogauthe

NDTensors/src/lib/BlockSparseArrays/test/test_basics.jl

@@ -15,7 +15,7 @@ using BlockArrays:
   blocksizes,
   mortar
 using Compat: @compat
-using LinearAlgebra: Adjoint, mul!
+using LinearAlgebra: Adjoint, mul!, norm
 using NDTensors.BlockSparseArrays:
   @view!,
   BlockSparseArray,
@@ -94,6 +94,9 @@ include("TestBlockSparseArraysUtils.jl")
         iszero(a[I])
       end
     end
+
+    a[3, 3] = NaN
+    @test isnan(norm(a))
   end
   @testset "Tensor algebra" begin
     a = BlockSparseArray{elt}(undef, ([2, 3], [3, 4]))

NDTensors/src/lib/SparseArrayInterface/src/sparsearrayinterface/map.jl

@@ -115,6 +115,6 @@ end
 function sparse_mapreduce(f, op, a::AbstractArray; init=reduce_init(f, op, a), kwargs...)
   output = mapreduce(f, op, sparse_storage(a); init, kwargs...)
   f_notstored = apply_notstored(f, a)
-  @assert op(output, eltype(output)(f_notstored)) == output
+  @assert isequal(op(output, eltype(output)(f_notstored)), output)
   return output
 end