document.location is null

[pkaminski]

This is one of those "this couldn't possibly happen" bugs, but I occasionally get the following exception from raven-js (which then ironically gets reported to Sentry correctly!):

TypeError: document.location is null
/js/bower_components/raven-js/dist/raven.js ? in getHttpData at line 1742:8
/js/bower_components/raven-js/dist/raven.js ? in send at line 1763:17
/js/bower_components/raven-js/dist/raven.js ? in processException at line 1707:4
/js/bower_components/raven-js/dist/raven.js ? in handlers at line 1588:4
/js/bower_components/raven-js/dist/raven.js ? in notifyHandlers at line 137:20
/js/bower_components/raven-js/dist/raven.js ? in processLastException at line 223:8
/js/bower_components/raven-js/dist/raven.js ? in func at line 254:16
/js/bower_components/raven-js/dist/raven.js ? in func at line 1251:23

This seems to only happen in Firefox within 1 second of the page loading and I expect it's some kind of browser or plugin bug, but perhaps it's worth guarding against anyway?

[mattrobenolt]