Fix: [bug #856] Mail error if destination user doesn't have an email
Merge pull request #896 from marcosgdf/bug-856

Fix: [bug #856] Mail error if destination user doesn't have an email
fix some indefined index
fix:  Assigning the return value of new by reference is deprecated
fix:  issue from last commit
fix: Undefined property: mod_codeclient_monkey::$prefixIsRequired
fix: Undefined index
Fix: [ bug #855 ] Holiday approval email in French
Fix: [ bug #855 ] Holiday approval email in French
Merge pull request #897 from grandoc/3.3

fix some indefined index