Cannot import parameters from an oprah exports file

# This is a Bug Report

## Description
I can't import parameters from an oprah exports file.

```bash
# yarn oprah export -s acg
Oprah: Stage --> acg
Oprah: Config --> /Users/taylor/Documents/projects/src/acloudguru/cloud-optimization/aws/cost-and-usage/oprah.yml
Oprah: Getting parameters..
Oprah: Saving parameters to: /tmp/oprah-exports.json
Oprah: Done.
✨ Done in 1.02s.

# yarn oprah import -s acg
Oprah: Stage --> acg
Oprah: Config --> /Users/taylor/Documents/projects/src/acloudguru/cloud-optimization/aws/cost-and-usage/oprah.yml
Oprah: Getting parameters from: /tmp/oprah-exports.json
Oprah: Updating config...
Oprah: ERROR: TypeError: Reduce of empty array with no initial value
```

For bug reports:
* What went wrong? I was unable to import parameters from a file generated by `oprah export`
* What did you expect should have happened? I should be able to run `oprah export`, then run `oprah import` using the same file.
* What was the config you used?
```yaml
service: optimization-service
provider:
name: ssm

config:
path: /${stage}/optimization/config

defaults:
NOTIFICATION_EMAIL: dev-accounts@acloud.guru
SLACK_WORKSPACE_ID: # PineHeadGurus
SLACK_CHANNEL_ID: # wg-cost-control

test:
INCLUDE_RESOURCE_IDS: true

acg:
ORGANISATION_NAME: acloudguru
INCLUDE_RESOURCE_IDS: true
DAILY_BUDGET_USD:
MONTHLY_BUDGET_USD:

laasprod:
ORGANISATION_NAME: laasprod
INCLUDE_RESOURCE_IDS: false
DAILY_BUDGET_USD:
MONTHLY_BUDGET_USD:
```
* What stacktrace or error message from your provider did you see? `ERROR: TypeError: Reduce of empty array with no initial value`

For feature proposals:
* What is the use case that should be solved. The more detail you describe this in the easier it is to understand for us.
* If there is additional config how would it look

Similar or dependent issues:
* #12345

## Additional Data

* ***Stack Trace***:
* ***Provider Error messages***: