Style/MultilineWhenThen breaks case statements with {}

[tas50]

Expected behavior

The Style/MultilineWhenThen cop should remove then statements from all mulitline case statements w/o creating invalid ruby code.

Actual behavior

If RuboCop encounters a case statement that uses then and {}s it will just remove the then statements, which results in invalid ruby:

Steps to reproduce the problem

Run rubocop --only Style/MultilineWhenThen on the following code:

      case version.to_s # to_s to make sure someone didn't pass us an int
      when '9.0' then {
        'ActiveDirectory' => 'Veeam Explorer for Microsoft Active Directory',
        'SQL' => 'Veeam Explorer for Microsoft SQL Server',
        'Exchange' => 'Veeam Explorer for Microsoft Exchange',
        'SharePoint' => 'Veeam Explorer for Microsoft SharePoint',
        'Oracle' => 'Veeam Explorer for Oracle'
      }
     end

This will autocorrect to:

      case version.to_s # to_s to make sure someone didn't pass us an int
      when '9.0' {
        'ActiveDirectory' => 'Veeam Explorer for Microsoft Active Directory',
        'SQL' => 'Veeam Explorer for Microsoft SQL Server',
        'Exchange' => 'Veeam Explorer for Microsoft Exchange',
        'SharePoint' => 'Veeam Explorer for Microsoft SharePoint',
        'Oracle' => 'Veeam Explorer for Oracle'
      }
     end

RuboCop version

0.78.0