remove redundant empty lines from app/models/auth_source_ldap.rb

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013169
fix ProjectsHelperTest fails when config.threadsafe! is enabled (#12097)

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013170