Tweaked test scenario settings as it comes in need of RKXMLDictionarySerialization
Dealt with situation when with the following parameters:
    [XMLDictionaryParser sharedInstance].collapseTextNodes = NO;
    [XMLDictionaryParser sharedInstance].stripEmptyNodes = NO;
    [XMLDictionaryParser sharedInstance].attributesMode = XMLDictionaryAttributesModePrefixed;
    [XMLDictionaryParser sharedInstance].nodeNameMode = XMLDictionaryNodeNameModeNever;
The key ‘__text’  was missing in the node. Now the value is empty string. Ex.:
            emptyNode =             {
                "__text" = "";
            };
            notEmptyNode =             {
                "__text" = nodeValue;
            };