fix(dashboards): display errored funnel insights correctly

[thmsobrmlr]

Problem

Funnel insights with errors are displayed as "empty" on dashboards.

Changes

Fixes this.

How did you test this code?

Tested with an erroring funnel locally

[posthog-bot]

📸 UI snapshots have been updated

2 snapshot changes in total. 0 added, 2 modified, 0 deleted:

• chromium: 0 added, 2 modified, 0 deleted (diff for shard 1)
• webkit: 0 added, 0 modified, 0 deleted

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[github-actions[bot]]

Size Change: 0 B

Total Size: 1.05 MB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	1.05 MB

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