remove redundant empty lines from PluginTest

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11936 e93f8b46-1217-0410-a6f0-8f06a7374b81
German translation: grammar + spelling (#14222)

Contributed by Filou Centrinov.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11937 e93f8b46-1217-0410-a6f0-8f06a7374b81