[[ https://integration.wikimedia.org/ci/view/BrowserTests/view/MultimediaViewer/job/browsertests-MultimediaViewer-www.mediawiki.org-linux-firefox-sauce/910/console | browsertests-MultimediaViewer-www.mediawiki.org-linux-firefox-sauce ]] fails with `A JSON text must at least contain two octets! (JSON::ParserError)`
```
...
00:00:09.090 Feature: Multimedia Viewer performance
00:00:09.090
00:00:09.090 Background: # features/mmv.performance.feature:4
00:00:11.259 Given I am using a custom user agent # features/step_definitions/mmv_performance_steps.rb:26
00:00:11.259 And I am at a wiki article with at least two embedded pictures # features/step_definitions/mmv_steps.rb:3
00:00:11.259 A JSON text must at least contain two octets! (JSON::ParserError)
00:00:11.259 /mnt/home/jenkins-deploy/.gem/2.0.0/gems/json-1.8.3/lib/json/common.rb:155:in `initialize'
...
```