Problem Description

Steps to Reproduce

1. Create new DB with 2 collections
   --> Collections appeared in the Performance ->Hottest Collections table
2. Add some documents to one collection
3. Drop collection without data
   --> This collection is still displayed in the Hottest Collections table
4. Drop Db

Expected Results

Deleted collections are not displayed in the Hottest Collections table after deletion.

Actual Results

Collections are still displayed in the Hottest Collections table even after refresh or reconnect to cluster

Additional Notes

If collection didn't contain data it disappears from the table after deletion:

1. Create new DB with collection
   --> Collection appeared in the Performance -> Hottest Collections table
2. Drop DB
   --> Collection disappears from Hottest Collections table after some time or after reconnect to cluster