[FEED PARSER][NIFS] fixed missing content_type
[FEED PARSER][NIFS] fixed missing content_type

SDNTB-549

ioanpocol/superdesk-ntb,petrjasek/superdesk-ntb,superdesk/superdesk-ntb,superdesk/superdesk-ntb,superdesk/superdesk-ntb,petrjasek/superdesk-ntb,ioanpocol/superdesk-ntb,petrjasek/superdesk-ntb,ioanpocol/superdesk-ntb,petrjasek/superdesk-ntb,superdesk/superdesk-ntb