Fix construction of empty identity matrix

[christiangnrd]

Brings behaviour in line with Base

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diff --git a/test/testsuite/construction.jl b/test/testsuite/construction.jl
index 50ae02e..742fd8e 100644
--- a/test/testsuite/construction.jl
+++ b/test/testsuite/construction.jl
@@ -131,7 +131,7 @@
             @test Array(A) == one(rand(T, 2, 2))
 
             A = one(AT(rand(T, 0, 0)))
-            @test A isa AT{T,2}
+            @test A isa AT{T, 2}
             @test Array(A) == one(rand(T, 0, 0))
 
             A = oneunit(AT(rand(T, 2, 2)))