Improper warning

[andreasvarga]

The following warning is not necessary and is possibly misleading:

julia> (A, B) = (Matrix{Complex{BigFloat}}(undef, 0, 0), Matrix{Complex{BigFloat}}(undef, 0, 0))
(Matrix{Complex{BigFloat}}(undef, 0, 0), Matrix{Complex{BigFloat}}(undef, 0, 0))

julia> schur(A,B)
┌ Warning: convergence failure; factorization incomplete at ilast=0
└ @ GenericSchur C:\Users\Andreas\.julia\packages\GenericSchur\8grtV\src\generalized.jl:167
GeneralizedSchur{Complex{BigFloat}, Matrix{Complex{BigFloat}}, Vector{Complex{BigFloat}}, Vector{Complex{BigFloat}}}
S factor:
0×0 Matrix{Complex{BigFloat}}
T factor:
0×0 Matrix{Complex{BigFloat}}
Q factor:
0×0 Matrix{Complex{BigFloat}}
Z factor:
0×0 Matrix{Complex{BigFloat}}
α:
Complex{BigFloat}[]
β:
Complex{BigFloat}[]