Apply suggestions from code review

Co-authored-by: Jutho <Jutho@users.noreply.github.com>

Author: lkdvos

src/tensors/linalg.jl

@@ -290,8 +290,9 @@ function LinearAlgebra.rank(
         t::AbstractTensorMap;
         atol::Real = 0, rtol::Real = atol > 0 ? 0 : _default_rtol(t)
     )
-    r = zero(dimscalartype(sectortype(t)))
-    iszero(dim(t)) && return r
+    r = dim(t)
+    iszero(r) && return r
+    r = zero(r)
     S = MatrixAlgebraKit.svd_vals(t)
     tol = max(atol, rtol * maximum(parent(S)))
     for (c, b) in pairs(S)