Invalid export path crashes etherpad

[jsimpsoncd]

Client: Chrome, various versions.
Host: Linux Mint 18, x64, based on Ubuntu 16.04 LTS npm 3.5.2 and nodejs 4.2.6
steps to reproduce
Start etherpad (I started via debugRun.sh). visit an invalid export path, example:
http://localhost:9001/p/path/pad/export/txt
what you expected to happen
An error, or a failed export.
what actually happened
etherpad crashed

[jdittrich]

Thanks!

I just tried it with the demo and got:

Error: remote exception: remote exception: remote exception: remote exception: remote exception: remote exception: expected headersComplete; HTTP response from sandboxed app had incomplete headers.
at Error (native)
C++ location:(remote):??
type: failed

Have not tried it locally yet.

[Gared]

@jdittrich Thx for reporting this bug. If you have time please test my PR

[jdittrich]

@Gared With your change, I don't get a crash and I can continue to write. Minor problem: The page now continues to show the "reloading" indicator.

[Gared]

@jdittrich I know, but this fixes the crash. If you think we should fix this behaviour please reopen this issue

[jdittrich]

@Gared: I think teh reload indication is a non-harmful edgecase, so I'd leave this issue closed.