`list_databases` immediately after InfluxDB creation throws error

[MarcMush]

I don't know if this should really considered a bug, but I scratched my head quite a lot on this, before understanding what was happening so here it is:

calling list_databases immediately after creation of an empty influxdb docker throws an error.

I guess the influxdb didn't create its default database _internal yet, so the field "values" doesn't exist in influx's responses

julia> using InfluxDB

julia> begin
       global container_id = chomp(read(`docker run -d --rm -p 8086:8086 influxdb`, String))
       list_databases(InfluxServer("localhost"))
       end
ERROR: KeyError: key "values" not found
Stacktrace:
  [1] getindex
    @ .\dict.jl:482 [inlined]
  [2] (::InfluxDB.var"#series_df#17")(series_dict::Dict{String, Any})
    @ InfluxDB ~\.julia\packages\InfluxDB\xL7Dy\src\server.jl:73
  [3] _broadcast_getindex_evalf
    @ .\broadcast.jl:648 [inlined]
  [4] _broadcast_getindex
    @ .\broadcast.jl:621 [inlined]
  [5] getindex
    @ .\broadcast.jl:575 [inlined]
  [6] macro expansion
    @ .\broadcast.jl:984 [inlined]
  [7] macro expansion
    @ .\simdloop.jl:77 [inlined]
  [8] copyto!
    @ .\broadcast.jl:983 [inlined]
  [9] copyto!
    @ .\broadcast.jl:936 [inlined]
 [10] copy(bc::Base.Broadcast.Broadcasted{Base.Broadcast.DefaultArrayStyle{1}, Tuple{Base.OneTo{Int64}}, InfluxDB.var"#series_df#17", Tuple{Vector{Any}}})
    @ Base.Broadcast .\broadcast.jl:908
 [11] materialize
    @ .\broadcast.jl:883 [inlined]
 [12] query(server::InfluxServer, query_data::Dict{String, String}; type::Symbol)
    @ InfluxDB ~\.julia\packages\InfluxDB\xL7Dy\src\server.jl:79
 [13] query
    @ ~\.julia\packages\InfluxDB\xL7Dy\src\server.jl:49 [inlined]
 [14] #query#19
    @ ~\.julia\packages\InfluxDB\xL7Dy\src\server.jl:83 [inlined]
 [15] query
    @ ~\.julia\packages\InfluxDB\xL7Dy\src\server.jl:83 [inlined]
 [16] list_databases(server::InfluxServer)
    @ InfluxDB ~\.julia\packages\InfluxDB\xL7Dy\src\database.jl:8
 [17] top-level scope
    @ REPL[2]:3

julia> list_databases(InfluxServer("localhost"))
1-element Vector{DataFrames.DataFrame}:
 1×1 DataFrame
 Row │ name
     │ String
─────┼───────────
   1 │ _internal

On my computer, it takes 10 to 15 seconds for the database to initialize

julia> begin
       global container_id = chomp(read(`docker run -d --rm -p 8086:8086 influxdb`, String))

       a = true
       @time while a
           a = try
               list_databases(InfluxServer("localhost"))
               false
           catch
               sleep(1)
               true
           end
       end
       end
 12.534306 seconds (5.61 k allocations: 529.078 KiB)

At least a more explicit error message would be helpful