Markdown: empty list item breaks terminal display

[fonsp]

but the parsing is fine, and HTML display still works.

julia> using Markdown

julia> md"""
       1. hello
       2. world
       """
    1. hello

    2. world

julia> md"""
       1. hello
       2. 
       """
    1. hello

    2. Error showing value of type Markdown.MD:
ERROR: BoundsError: attempt to access 0-element Vector{AbstractString} at index [1]
Stacktrace:
  [1] getindex
    @ ./array.jl:801 [inlined]
  [2] print_wrapped(io::IOContext{Base.TTY}, s::Function; width::Int64, pre::String, i::Int64)
    @ Markdown /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/Markdown/src/render/terminal/formatting.jl:45
  [3] #print_wrapped#166
    @ /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/Markdown/src/render/terminal/formatting.jl:52 [inlined]
  [4] term(io::IOContext{Base.TTY}, md::Markdown.List, columns::Int64)
    @ Markdown /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/Markdown/src/render/terminal/render.jl:73
  [5] term(io::IOContext{Base.TTY}, content::Vector{Any}, cols::Int64)
    @ Markdown /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/Markdown/src/render/terminal/render.jl:13
  [6] term
    @ /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/Markdown/src/render/terminal/render.jl:16 [inlined]
  [7] show(io::IOContext{Base.TTY}, #unused#::MIME{Symbol("text/plain")}, md::Markdown.MD)
    @ Markdown /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/Markdown/src/render/terminal/render.jl:176
  [8] (::REPL.var"#38#39"{REPL.REPLDisplay{REPL.LineEditREPL}, MIME{Symbol("text/plain")}, Base.RefValue{Any}})(io::Any)
    @ REPL /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:220
  [9] with_repl_linfo(f::Any, repl::REPL.LineEditREPL)
    @ REPL /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:462
 [10] display(d::REPL.REPLDisplay, mime::MIME{Symbol("text/plain")}, x::Any)
    @ REPL /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:213
 [11] display(d::REPL.REPLDisplay, x::Any)
    @ REPL /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:225
 [12] display(x::Any)
    @ Base.Multimedia ./multimedia.jl:328
 [13] #invokelatest#2
    @ ./essentials.jl:707 [inlined]
 [14] invokelatest
    @ ./essentials.jl:706 [inlined]
 [15] print_response(errio::IO, response::Any, show_value::Bool, have_color::Bool, specialdisplay::Union{Nothing, AbstractDisplay})
    @ REPL /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:247
 [16] (::REPL.var"#40#41"{REPL.LineEditREPL, Pair{Any, Bool}, Bool, Bool})(io::Any)
    @ REPL /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:231
 [17] with_repl_linfo(f::Any, repl::REPL.LineEditREPL)
    @ REPL /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:462
 [18] print_response(repl::REPL.AbstractREPL, response::Any, show_value::Bool, have_color::Bool)
    @ REPL /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:229
 [19] (::REPL.var"#do_respond#61"{Bool, Bool, REPL.var"#72#82"{REPL.LineEditREPL, REPL.REPLHistoryProvider}, REPL.LineEditREPL, REPL.LineEdit.Prompt})(s::REPL.LineEdit.MIState, buf::Any, ok::Bool)
    @ REPL /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:798
 [20] #invokelatest#2
    @ ./essentials.jl:707 [inlined]
 [21] invokelatest
    @ ./essentials.jl:706 [inlined]
 [22] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
    @ REPL.LineEdit /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/REPL/src/LineEdit.jl:2441
 [23] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
    @ REPL /Users/julia/src/julia/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:1126
 [24] (::REPL.var"#44#49"{REPL.LineEditREPL, REPL.REPLBackendRef})()
    @ REPL ./task.jl:406

julia> repr(MIME"text/html"(), ans)
"<div class=\"markdown\"><ol>\n<li><p>hello</p>\n</li>\n<li></li>\n</ol>\n</div>"

Julia 1.6.0-beta1, not a bug on Julia 1.5.3