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When searching blobs in a project: undefined method `encoding' for nil:NilClass

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Summary

Search returns a 500 NoMethodError

Steps to reproduce

Make a search like http://localhost:3000/search?utf8=%E2%9C%93&snippets=&scope=blobs&search=foo&project_id=1

Some terms seem to work (e.g., 'bar' works locally, returning results), while others fail. I'm not sure on the difference yet.

What is the current bug behavior?

Screenshot_from_2017-08-23_21-44-14

Screenshot_from_2017-08-24_08-24-34

Screenshot_from_2017-08-24_08-24-00

Screenshot_from_2017-08-24_08-24-53

What is the expected correct behavior?

Search results

Relevant logs and/or screenshots

NoMethodError - undefined method `encoding' for nil:NilClass:
  rouge (2.2.0) lib/rouge/lexer.rb:247:in `assert_utf8!'
  rouge (2.2.0) lib/rouge/lexer.rb:387:in `lex'
  rouge (2.2.0) lib/rouge/formatter.rb:59:in `token_lines'
  lib/rouge/formatters/html_gitlab.rb:16:in `stream'
  rouge (2.2.0) lib/rouge/formatter.rb:37:in `format'
  rouge (2.2.0) lib/rouge/formatter.rb:25:in `format'
  lib/gitlab/highlight.rb:50:in `highlight_plain'
  lib/gitlab/highlight.rb:56:in `rescue in highlight_rich'
  lib/gitlab/highlight.rb:54:in `highlight_rich'
  lib/gitlab/highlight.rb:45:in `highlight_text'
  lib/gitlab/highlight.rb:18:in `highlight'
  lib/gitlab/highlight.rb:5:in `highlight'
  app/helpers/blob_helper.rb:3:in `highlight'
  app/views/shared/_file_highlight.html.haml:16:in `_app_views_shared__file_highlight_html_haml___2268168918962266686_47203943893780'

Possible fixes