circshift(::Tuple{}, ::Int) throws DivideError instead of returning

[nsajko]

We should have circshift((), n::Int) == (), as with arrays.

julia> circshift((), 1)
ERROR: DivideError: integer division error
Stacktrace:
 [1] div
   @ ./int.jl:295 [inlined]
 [2] div
   @ ./div.jl:310 [inlined]
 [3] div
   @ ./div.jl:355 [inlined]
 [4] fld
   @ ./div.jl:321 [inlined]
 [5] mod
   @ ./int.jl:287 [inlined]
 [6] mod1
   @ ./operators.jl:875 [inlined]
 [7] circshift(x::Tuple{}, shift::Int64)
   @ Base ./tuple.jl:697
 [8] top-level scope
   @ REPL[1]:1

julia> versioninfo()
Julia Version 1.12.0-DEV.415
Commit aeac2891630 (2024-04-26 03:00 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 8 × AMD Ryzen 3 5300U with Radeon Graphics
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, znver2)
Threads: 1 default, 0 interactive, 1 GC (on 8 virtual cores)

Fix incoming.

[aravindh-krishnamoorthy]

@nsajko Sorry for this bug 😥

[nsajko]

@aravindh-krishnamoorthy everyone makes mistakes. Your PR had multiple reviewers, after all, and I only found the bug now.