Update saving and loading.jl: e is not defined

[pankgeorg]

fixes

└ @ Pluto ~/.julia/packages/Pluto/qz8Mi/src/notebook/saving and loading.jl:238
┌ Error: Exception while generating log record in module Pluto at /home/pgeorgakopoulos/.julia/packages/Pluto/qz8Mi/src/notebook/saving and loading.jl:238
│   exception =
│    UndefVarError: `e` not defined in `Pluto`
│    Suggestion: check for spelling errors or missing imports.
│    Stacktrace:
│      [1] macro expansion
│        @ ./logging/logging.jl:386 [inlined]
│      [2] _read_notebook_collected_cells!(io::IO)
│        @ Pluto ~/.julia/packages/Pluto/qz8Mi/src/notebook/saving and loading.jl:238
│      [3] load_notebook_nobackup(io::IO, path::AbstractString; skip_nbpkg::Bool)

Try this Pull Request!

Open Julia and type:

julia> import Pkg
julia> Pkg.activate(temp=true)
julia> Pkg.add(url="https://github.com/fonsp/Pluto.jl", rev="pankgeorg-patch-1")
julia> using Pluto