Fixes https://java.net/jira/browse/JAVASERVERFACES-3450, ViewScopeContextManager attempts to destroy a null instance of a @ViewScoped bean

git-svn-id: https://svn.java.net/svn/mojarra~svn@13773 761efcf2-d34d-6b61-9145-99dcacc3edf1
Fixes https://java.net/jira/browse/JAVASERVERFACES_SPEC_PUBLIC-1254, contracts attribute too restrictive.

git-svn-id: https://svn.java.net/svn/mojarra~svn@13774 761efcf2-d34d-6b61-9145-99dcacc3edf1