return all campaigns if no params
return all campaigns if no params

unicef/polio,unicef/polio,unicef/polio,unicef/rhizome,SeedScientific/polio,SeedScientific/polio,unicef/rhizome,SeedScientific/polio,SeedScientific/polio,unicef/rhizome,unicef/polio,SeedScientific/polio,unicef/rhizome