when using IAM the environment var for password cannot take empty string

### Pre-reqs

- [x] I've searched the current open issues
- [x] I've updated to the latest versions

### Extension Version

0.1.1

### Gemini CLI Version

0.6

### Environment

unsure

### Current Behavior

fails

### Expected Behavior

expect it to work

### Steps to reproduce?

1. ?
2. ?
3. ?
...


### Additional Details

_No response_