fix: Make sure deltas returned from SDK have a value

[garethfuller]

Description

Fixes https://balancer-labs.sentry.io/share/issue/25a25924306642c092da4100eb07f3d8/

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have performed a self-review of my own code
• I have requested at least 1 review (If the PR is significant enough, use best judgement here)
• I have commented my code where relevant, particularly in hard-to-understand areas
• If package-lock.json has changes, it was intentional.
• The base of this PR is master if hotfix, develop if not

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
beta-app-v2	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 4, 2023 10:23am

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