Tests fails on master because of change to Exception internals

[andreasnoack]

DistributedArrays.jl/test/darray.jl

Lines 357 to 384 in 5aaed0b

	try
	sum(DA, dims=-1)
	catch err
	if isa(err, CompositeException)
	@test !isempty(err.exceptions)
	for excep in err.exceptions
	# Unpack the remote exception
	orig_err = excep.ex.captured.ex
	@test isa(orig_err, ArgumentError)
	end
	else
	@test isa(err, ArgumentError)
	end
	end
	try
	sum(DA, dims=0)
	catch err
	if isa(err, CompositeException)
	@test !isempty(err.exceptions)
	for excep in err.exceptions
	# Unpack the remote exception
	orig_err = excep.ex.captured.ex
	@test isa(orig_err, ArgumentError)
	end
	else
	@test isa(err, ArgumentError)
	end
	end

hooks into internals of the exceptions which seems to have changed in Julia 1.3 causing an error, see https://gist.github.com/KristofferC/bd078abfa9434082d9100e799280107d#file-distributedarrays-log