gh-md-toc fails silently with an empty toc on lack of network connectivity #48
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Finally took the time to find out why I was getting empty tocs once in a while....
I move between my personal office and clients location where I'm frequently behind a proxy. I don't always set the outgoing proxy in my shell. It happens that gh-md-toc needs network connectivity, even to parse local file. But it fails silently with an empty toc in those cases. This is misleading.
This PR fixes this and fails with a message to check network connection, both for remote and local files.