Fix undefined method `status' for #<RuboCop::ConfigNotFoundError> (No…

…MethodError)

```
$ rubocop -c file_that_does_not_exist.yml foo.rb
Configuration file not found: /Users/onaka/src/github.com/bbatsov/rubocop/file_that_does_not_exist.yml
Traceback (most recent call last):
        6: from /Users/onaka/.gem/ruby/2.6.0/bin/rubocop:23:in `<main>'
        5: from /Users/onaka/.gem/ruby/2.6.0/bin/rubocop:23:in `load'
        4: from /Users/onaka/.gem/ruby/2.6.0/gems/rubocop-0.53.0/bin/rubocop:12:in `<top (required)>'
        3: from /opt/rubies/2.6.0-dev/lib/ruby/2.6.0/benchmark.rb:308:in `realtime'
        2: from /Users/onaka/.gem/ruby/2.6.0/gems/rubocop-0.53.0/bin/rubocop:13:in `block in <top (required)>'
        1: from /Users/onaka/.gem/ruby/2.6.0/gems/rubocop-0.53.0/lib/rubocop/cli.rb:36:in `run'
/Users/onaka/.gem/ruby/2.6.0/gems/rubocop-0.53.0/lib/rubocop/cli.rb:44:in `rescue in run': undefined method `status' for #<RuboCop::ConfigNotFoundError:0x00007fd0b808e040> (NoMethodError)
```

CHANGELOG.md

@@ -8,6 +8,7 @@
 * [#5623](https://github.com/bbatsov/rubocop/pull/5623): Fix `Bundler/OrderedGems` when a group includes duplicate gems. ([@colorbox][])
 * [#5633](https://github.com/bbatsov/rubocop/pull/5633): Fix broken `--fail-fast`. ([@mmyoji][])
 * [#5630](https://github.com/bbatsov/rubocop/issues/5630): Fix false positive for `Style/FormatStringToken` when using placeholder arguments in `format` method. ([@koic][])
+* [#5651](https://github.com/bbatsov/rubocop/pull/5651): Fix NoMethodError when specified config file that does not exist. ([@onk][])
 
 ### Changes
 

lib/rubocop/cli.rb

@@ -41,7 +41,7 @@ def run(args = ARGV)
       execute_runners(paths)
     rescue RuboCop::ConfigNotFoundError => e
       warn e.message
-      e.status
+      STATUS_ERROR
     rescue RuboCop::Error => e
       warn Rainbow("Error: #{e.message}").red
       STATUS_ERROR