Don't test empty matrices on v1.6

Author: jishnub

test/runtests.jl

@@ -2756,7 +2756,7 @@ end
 @testset "eigen" begin
     sortby = x -> (real(x), imag(x))
     @testset "AbstractFill" begin
-        @testset for val in (2.0, -2, 3+2im, 4 - 5im, 2im), n in (0, 1, 4)
+        @testset for val in (2.0, -2, 3+2im, 4 - 5im, 2im), n in (VERSION >= v"1.10" ? (0, 1, 4) : (1, 4))
             F = Fill(val, n, n)
             M = Matrix(F)
             @test eigvals(F; sortby) ≈ eigvals(M; sortby)