如何检查集合是否存在MongoDB Golang(How to check if collection exists or not MongoDB Golang)

I am new to GO language and I am using MongoDB with it. I am creating a backend for an application and its frontend on Angular 4. I want to check if collection exists or not.

Here is my code and I have checked it using nil.

collection := GetCollection("users")    
fmt.Println("collection", collection)   
if collection == nil {      
   fmt.Println("Collection is empty")   
}

I have created a GetCollection function which return a collection when we pass it a collection name. So when if there is no collection how can I check that if it exists or not? I have tried many things but failed.