fetchDialogWithID fixes: - added memory storage check; - added multicastDelegate after dialog was added to memory storage.
fetchDialogWithID fixes:
- added memory storage check;
- added multicastDelegate after dialog was added to memory storage.

QuickBlox/q-municate-services-ios,Rusik/QMServices,QuickBlox/q-municate-services-ios,Rusik/QMServices,Rusik/QMServices