[NITF] [FORMATTER] always add an ednote ed-msg element
[NITF] [FORMATTER] always add an ednote ed-msg element

ed-msg element is now added event if ednode is empty

SDNTB-280

superdesk/superdesk-core,mugurrus/superdesk-core,hlmnrmr/superdesk-core,marwoodandrew/superdesk-core,hlmnrmr/superdesk-core,mdhaman/superdesk-core,mugurrus/superdesk-core,nistormihai/superdesk-core,superdesk/superdesk-core,ioanpocol/superdesk-core,ancafarcas/superdesk-core,petrjasek/superdesk-core,ioanpocol/superdesk-core,superdesk/superdesk-core,superdesk/superdesk-core,petrjasek/superdesk-core,mdhaman/superdesk-core,petrjasek/superdesk-core,marwoodandrew/superdesk-core,petrjasek/superdesk-core,ioanpocol/superdesk-core,nistormihai/superdesk-core,mugurrus/superdesk-core,ancafarcas/superdesk-core,mdhaman/superdesk-core