Fix XML buglet: not returning the 'success' error code when retrieving cached XML data of type string.
Fix XML buglet: not returning the 'success' error code when retrieving
cached XML data of type string.

code-google-com/openshadinglanguage,code-google-com/openshadinglanguage,code-google-com/openshadinglanguage,code-google-com/openshadinglanguage