Remove trailing comma in 0-dim reshape summary

[jishnub]

Currently, there is an extra comma in displaying the summary for a 0-dim ReshapedArray:

julia> reshape(1:1)
0-dimensional reshape(::UnitRange{Int64}, ) with eltype Int64:
1

This PR only prints the comma if dims isn't empty, so that we now obtain

julia> reshape(1:1)
0-dimensional reshape(::UnitRange{Int64}) with eltype Int64:
1

[ViralBShah]

Looks fine to me. @oscardssmith can you also take a look? Tests are passing, but I wonder if this can affect any packages.

[ViralBShah]

I am merging because it seems like it shouldn't be a problem - but is easy to revert if necessary.