Fix Performance/Count cop error on empty selector block
#498
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koic
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changelog/fix_performance_count_cop_error_on_empty_selector_block.md
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Something like
```ruby
collection.reject { }.size
```
would lead to an error
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Something like
would lead to an error
Before submitting the PR make sure the following are checked:
[Fix #issue-number](if the related issue exists).master(if not - rebase it).bundle exec rake default. It executes all tests and runs RuboCop on its own code.{change_type}_{change_description}.mdif the new code introduces user-observable changes. See changelog entry format for details.