Return nil when parsing a string for items fails. Check this return value and not the returned error for failure. This means that if the user chose to ignore a parsing error, this error will indeed be ignored. 
Return nil when parsing a string for items fails. Check this return value and not the returned error for failure. This means that if the user chose to ignore a parsing error, this error will indeed be ignored. 

git-svn-id: cb3fc60f0f557b927b8032d8a94e869b6f9f230b@784 0fceea05-a30d-0410-8a8b-80ef821fb0a1

camillobruni/skim,camillobruni/skim,camillobruni/skim,jasongrout/skim,camillobruni/skim,jasongrout/skim