Preserve field values on bulk edit failure (#13943).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11787 e93f8b46-1217-0410-a6f0-8f06a7374b81
Fixed that bulk copy raises an error on validation failure (#13943).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11788 e93f8b46-1217-0410-a6f0-8f06a7374b81
Fixed test broken by r11787 (#13943).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11789 e93f8b46-1217-0410-a6f0-8f06a7374b81