[BUG] evaluating weave block to start julia gives "invisible character" error

[ssfrr]

Please search existing issues to avoid duplicates.

Steps to reproduce

1. open a fresh Juno session (without starting Julia)
2. In a weave .jmd file, create a code block with 1+1 inside of it
3. press alt-enter to evaluate the whole block

I get the error:

ERROR: syntax: invisible character \u200b near column 1
Stacktrace:
 [1] top-level scope at none:0

Debug Info:

Atom:

Version: 1.43.0
Dev Mode: false
Official Release: true
{
"http_parser": "2.8.0",
"node": "10.11.0",
"v8": "6.9.427.31-electron.0",
"uv": "1.23.0",
"zlib": "1.2.11",
"ares": "1.14.0",
"modules": "69",
"nghttp2": "1.33.0",
"napi": "3",
"openssl": "1.1.0",
"electron": "4.2.7",
"chrome": "69.0.3497.128",
"icu": "62.2",
"unicode": "11.0",
"cldr": "33.1",
"tz": "2019a"
}

julia-client:

Version: 0.12.0
Config:
{
"firstBoot": false,
"juliaOptions": {
"bootMode": "Basic",
"noAutoParenthesis": true
},
"juliaPath": "/home/sfr/local/bin/julia",
"remoteOptions": {
"tmux": true
},
"uiOptions": {
"enableMenu": true,
"enableToolBar": true
}
}

ink:

Version: 0.12.0
Config:
{
"monotypeResults": true
}

uber-juno:

Version: 0.3.0
Config:
{
"disable": true
}

language-julia:

Version: 0.19.2
Config:
undefined

language-weave:

Version: 0.6.7
Config:
undefined

indent-detective:

Version: 0.4.0
Config:
undefined

latex-completions:

Version: 0.3.6
Config:
undefined

versioninfo():

Julia Version 1.3.1
Commit 2d5741174c (2019-12-30 21:36 UTC)
Platform Info:
OS: Linux (x86_64-pc-linux-gnu)
CPU: Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-6.0.1 (ORCJIT, skylake)
Environment:
JULIA_EDITOR = atom -a
JULIA_NUM_THREADS = 2
JULIA_PKG_DEVDIR = /home/sfr/Dropbox/juliadev

Status `~/.julia/environments/v1.3/Project.toml`

[c52e3926] Atom v0.12.2
[6e4b80f9] BenchmarkTools v0.4.3
[12aac903] BinaryBuilder v0.2.3
[5789e2e9] FileIO v1.2.2
[e5e0dc1b] Juno v0.8.0
[b13ce0c6] LibSndFile v2.2.0
[9b87118b] PackageCompiler v0.6.5
[14b8a8f1] PkgTemplates v0.6.4
[91a5bcdd] Plots v0.28.4
[295af30f] Revise v2.5.1
[bd7594eb] SampledSignals v2.1.0
[44cfe95a] Pkg