Bounds error when formatting test/loading.jl on master julia branch

[KristofferC]

Formatting `test/loading.jl` ................................................. ✖
ERROR: BoundsError: attempt to access 0-element Vector{UInt8} at index [0]
Stacktrace:
 [1] getindex
   @ ./essentials.jl:13 [inlined]
 [2] indent_multiline_strings(ctx::Runic.Context, node::Runic.Node)
   @ Runic ~/.julia/packages/Runic/ruDzr/src/runestone.jl:2795
 [3] format_node!(ctx::Runic.Context, node::Runic.Node)
   @ Runic ~/.julia/packages/Runic/ruDzr/src/Runic.jl:321
 [4] format_node_with_kids!(ctx::Runic.Context, node::Runic.Node)
   @ Runic ~/.julia/packages/Runic/ruDzr/src/Runic.jl:235
 [5] format_node!(ctx::Runic.Context, node::Runic.Node)
   @ Runic ~/.julia/packages/Runic/ruDzr/src/Runic.jl:333