Not all streams shown

Using the latest version of awslogs, I cannot see all streams in some log groups. For example, `aws logs describe-log-streams --log-group-name ` returns ten log streams, but `awslogs streams ` only returns two or three (and it's not consistent).

Similarly, there are some streams I can specify using `awslogs get `, while other streams which do exist return `No streams match your pattern ''.`

Regardless of this, calling `awslogs get ` without specifying a stream name always seems to work and return all streams.

Any ideas?

Start by reproducing the discrepancy with the mentioned `awslogs streams` and `awslogs get` commands, comparing their results with `aws logs describe-log-streams`. Trace how each command discovers and matches streams; done means all existing streams are listed and can be selected consistently by name.

Written by the indexing model from the issue text.