protect against empty key reads

[dferber90]

Previously trying to call get("") with an empty string would throw an Edge Config not found error

Now

• get("") returns undefined
• has("") returns false

[vercel[bot]]

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[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: e038308b70ce820b944640a8196f0f4eb5a7c490

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

| Name | Type | | ------------------------------------- | ----- | | @vercel/edge-config | Patch | | vercel-storage-integration-test-suite | Patch |

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