Style/FileName raises if filename contains a space

[emil-rb]

When inspecting an file with a space in the name Rubocop raises.

$ rubocop git-hooks/file\ r.rb -d
For /home/user/workspaces/rb/services: configuration from /home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/config/default.yml
Inheriting configuration from /home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/config/enabled.yml
Inheriting configuration from /home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/config/disabled.yml
Inspecting 1 file
Scanning /home/user/workspaces/rb/services/git-hooks/file r.rb
An error occurred while Style/FileName cop was inspecting /home/user/workspaces/rb/services/git-hooks/file r.rb.
undefined method `start_with?' for nil:NilClass
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/cop/style/file_name.rb:52:in `shebang?'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/cop/style/file_name.rb:36:in `investigate'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/cop/commissioner.rb:91:in `block (2 levels) in invoke_custom_processing'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/cop/commissioner.rb:97:in `with_cop_error_handling'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/cop/commissioner.rb:90:in `block in invoke_custom_processing'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/cop/commissioner.rb:87:in `each'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/cop/commissioner.rb:87:in `invoke_custom_processing'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/cop/commissioner.rb:57:in `investigate'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/cop/team.rb:65:in `inspect_file'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/runner.rb:194:in `inspect_file'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/runner.rb:164:in `block in do_inspection_loop'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/runner.rb:158:in `loop'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/runner.rb:158:in `do_inspection_loop'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/runner.rb:87:in `process_file'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/runner.rb:59:in `block in inspect_files'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/runner.rb:57:in `each'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/runner.rb:57:in `inspect_files'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/runner.rb:35:in `run'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/lib/rubocop/cli.rb:30:in `run'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/bin/rubocop:14:in `block in <top (required)>'
/home/user/.rbenv/versions/2.3.0/lib/ruby/2.3.0/benchmark.rb:308:in `realtime'
/home/user/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.37.2/bin/rubocop:13:in `<top (required)>'
/home/user/.rbenv/versions/2.3.0/bin/rubocop:23:in `load'
/home/user/.rbenv/versions/2.3.0/bin/rubocop:23:in `<main>'
.

1 file inspected, no offenses detected

1 error occurred:
An error occurred while Style/FileName cop was inspecting /home/user/workspaces/rb/services/git-hooks/file r.rb.
Errors are usually caused by RuboCop bugs.
Please, report your problems to RuboCop's issue tracker.
Mention the following information in the issue report:
0.37.2 (using Parser 2.3.0.6, running on ruby 2.3.0 x86_64-linux)
Finished in 0.07673738700032118 seconds

$ rubocop -V
0.37.2 (using Parser 2.3.0.6, running on ruby 2.3.0 x86_64-linux)

The same thing happens with Ruby 2.1, but not with 2.2. The file in question is empty.

[alexdowad]

The problem is that the file is empty, not that the name contains a space.

[alexdowad]

Uh... I guess it's the combination.

[alexdowad]

Just pushing a fix to my open PR.