fix(sdk): return undefined from parseFillLogs on empty logs

[devtechedge]

Summary

parseFillLogs currently builds blockData from logs[0] before checking whether any fill event is present. When callers pass an empty logs array (a valid "no fill found" case), that access throws a TypeError instead of returning undefined.

This change adds an early return for logs.length === 0, matching the existing no-match behavior for non-empty logs that do not contain a fill event.

Changes

• Guard parseFillLogs so an empty logs array returns undefined
• Add unit tests covering empty logs and unrelated non-fill logs

Test plan

• vitest run test/unit/actions/parseFillLogs.test.ts (empty array and non-fill logs both return undefined)
• Reviewers: confirm callers that already treat a missing fill as undefined continue to work as expected

Fixes #268

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