test: reduce unnecessary output

* lib/test/unit.rb (Test::Unit::Runner#_run_parallel): print retrying
  message only if retrying.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36111 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/test/unit.rb

@@ -611,9 +611,10 @@ def _run_parallel suites, type, result
             suites.map {|r| r[:file]}.uniq.each {|file| require file}
             suites.map! {|r| eval("::"+r[:testcase])}
             del_status_line or puts
-            puts "Retrying..."
-            puts ""
-            _run_suites(suites, type)
+            unless suites.empty?
+              puts "Retrying..."
+              _run_suites(suites, type)
+            end
           end
           unless rep.empty?
             rep.each do |r|