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fix Ruby 2.2 warning at lib/redmine/scm/adapters/cvs_adapter.rb. On ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-linux]: <pre> lib/redmine/scm/adapters/cvs_adapter.rb:342: warning: Comparable#== will no more rescue exceptions of #<=> in the next release. lib/redmine/scm/adapters/cvs_adapter.rb:342: warning: Return nil in #<=> if the comparison is inappropriate or avoid such comparison. </pre> git-svn-id: http://svn.redmine.org/redmine/branches/2.6-stable@13834 e93f8b46-1217-0410-a6f0-8f06a7374b81