ArgumentError: reducing over an empty collection is not allowed

[KenZhenLin]

Hello, this package has been very helpful! But I got this error: "ArgumentError: reducing over an empty collection is not allowed" by running the following example in Julia 1.3.1:

Random.seed!(1234)
n = 5
m = 3
P = randn(n,n)
P = (P+P')/2
P = 2*P
q = randn(n)
A = randn(m,n)
b = rand(m)
rmax = 2.5
x=QPnorm.solve(P, q, A, b, zeros(n); r_min=0.0, r_max = rmax)

It looks like the error occurs in the maximum function in line 331 of qp_norm_boundary.jl. Could you please provide some help? Thanks!

The complete problem data are given below:

P
5×5 Array{Float64,2}:
1.73469 1.31013 -1.05498 -0.792818 2.42857
1.31013 1.06563 -0.291027 0.251159 -1.91372
-1.05498 -0.291027 0.256129 2.2225 0.277734
-0.792818 0.251159 2.2225 0.144233 -2.61016
2.42857 -1.91372 0.277734 -2.61016 -6.42272

q
5-element Array{Float64,1}:
-0.07401454242444336
0.1509756176321479
0.7692782605345824
-0.31015257323306406
-0.6027068905147959

A
3×5 Array{Float64,2}:
-1.27967 -0.036446 0.896748 -1.54143 -0.580517
0.997317 0.141974 -0.51353 -0.0801625 -0.315437
0.302423 0.521273 -0.764799 -1.09122 -1.36145

b
3-element Array{Float64,1}:
0.15050782744925795
0.14732938279328955
0.2834013103457036