Error with nonstandard log level due to BenchmarkTools

[gdalle]

I have a package where the CI uses BenchmarkTools.jl, and there is some logging with level -1 (see log level definition and log message generation).
This causes an error because only standard log levels are taken into account for the GitHub action (see CI log).

ERROR: LoadError: MethodError: no method matching *(::String, ::Nothing)

Closest candidates are:
  *(::Any, ::Any, ::Any, ::Any...)
   @ Base operators.jl:578
  *(::Union{AbstractChar, AbstractString}, ::Union{AbstractChar, AbstractString}...)
   @ Base strings/basic.jl:260
  *(::Union{AbstractChar, AbstractString}, ::Missing)
   @ Base missing.jl:183
  ...

Stacktrace:
  [1] command(cmd::Nothing, props::NamedTuple{(:file, :line), Tuple{String, Int64}}, val::String)
    @ GitHubActions ~/.julia/packages/GitHubActions/DMn4Q/src/GitHubActions.jl:66
  [2] handle_message(::GitHubActions.GitHubActionsLogger, level::Base.CoreLogging.LogLevel, msg::String, _module::Module, group::Symbol, id::Base.UUID, file::String, line::Int64; location::Nothing, kwargs::Base.Pairs{Symbol, Float64, Tuple{Symbol}, NamedTuple{(:progress,), Tuple{Float64}}})
    @ GitHubActions ~/.julia/packages/GitHubActions/DMn4Q/src/GitHubActions.jl:250

I believe the culprit is this block of code, which needs an else otherwise cmd might be nothing:

GitHubActions.jl/src/GitHubActions.jl

Lines 242 to 250 in bf65faa

	else
	cmd = if level === Debug
	"debug"
	elseif level === Warn
	"warning"
	elseif level === Error
	"error"
	end
	command(cmd, (file=file, line=line), message)

[gdalle]

Edit: this issue appears to be the same as #16. It will be solved by #25