Issue crashing graphgist portal

Fix error
Write test for error
App shouldn't crash when errors like this happen
Add front-end monitor for alerting when portal is down

Heroku logs:

2015-05-07T05:57:22.908400+00:00 app[web.1]: 10.69.24.23 - - [07/May/2015:05:57:22 +0000] "GET /robots.txt HTTP/1.1" 404 - "-" "Twitterbot/1.0"
2015-05-07T05:57:23.059993+00:00 app[web.1]: null
2015-05-07T05:57:22.908731+00:00 app[web.1]: GET /robots.txt 404 3.574 ms - -
2015-05-07T05:57:23.432747+00:00 app[web.1]: [Rollbar] Handling uncaught exception
2015-05-07T05:57:23.325134+00:00 app[web.1]: finding gist with id: dropboxs-xd595acwj8boulj%2Fgraphgist.adoc%3Fdl%3D0
2015-05-07T05:57:23.399204+00:00 app[web.1]: asciidoctor: ERROR: <stdin>: line 590: only book doctypes can contain level 0 sections
2015-05-07T05:57:23.598386+00:00 app[web.1]: [Rollbar] Successful api response
2015-05-07T05:57:23.434181+00:00 app[web.1]: [TypeError: Cannot set property 'html' of null]
2015-05-07T05:57:23.640814+00:00 heroku[router]: at=error code=H13 desc="Connection closed without response" method=GET path="/?_escaped_fragment_=/gists/dropboxs-xd595acwj8boulj%252Fgraphgist.adoc%253Fdl%253D0" host=graphgist.neo4j.com request_id=2e2af5e5-2a37-4bbb-86b1-056723a98530 fwd="199.59.148.211" dyno=web.1 connect=1ms service=633ms status=503 bytes=0
2015-05-07T05:57:24.628054+00:00 heroku[web.1]: State changed from up to crashed
2015-05-07T05:57:24.602763+00:00 heroku[web.1]: Process exited with status 1

neo4j-contrib / graphgist-cms

Issue crashing graphgist portal #83