PlotlyJS & savefig

General Usage
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2

I can reproduce this. I think the issue might lie with PlotlyJS but due to a limitation in parsing the very large JSON string generated from PlotlyJS. The error is very similar to what happens when JSON.jl tries to parse the empty string:

using JSON
JSON.parse("")

ERROR: Unexpected end of input
Line: 0
Around: ......
           ^

Stacktrace:
 [1] error(s::String)
   @ Base ./error.jl:33
 [2] _error(message::String, ps::JSON.Parser.MemoryParserState)
   @ JSON.Parser ~/.julia/packages/JSON/QXB8U/src/Parser.jl:140
 [3] byteat
   @ ~/.julia/packages/JSON/QXB8U/src/Parser.jl:49 [inlined]
 [4] parse_value(pc::JSON.Parser.ParserContext{Dict{String, Any}, Int64, true, nothing}, ps::JSON.Parser.MemoryParserState)
   @ JSON.Parser ~/.julia/packages/JSON/QXB8U/src/Parser.jl:160
 [5] parse(str::String; dicttype::Type, inttype::Type{Int64}, allownan::Bool, null::Nothing)
   @ JSON.Parser ~/.julia/packages/JSON/QXB8U/src/Parser.jl:450
 [6] parse(str::String)
   @ JSON.Parser ~/.julia/packages/JSON/QXB8U/src/Parser.jl:448

So my vague guess would be that the error occurs around here:
PlotlyJS ~/.julia/packages/PlotlyJS/4jzLr/src/kaleido.jl:104
when any empty string is given to JSON.parse().