Add empty string case for parse_blocks

[leynos]

Summary

• add a unit test for parse_blocks handling an empty string

Testing

• pyright
• ruff check
• pytest -q

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https://chatgpt.com/codex/tasks/task_e_68461fe1f51483228394613ad022e560

Summary by Sourcery

Tests:

• Add test_parse_blocks_empty to assert parse_blocks("") returns an empty list.

[sourcery-ai]

Reviewer's Guide

Introduces a new unit test to verify that parse_blocks returns an empty list when given an empty string.

File-Level Changes

Change	Details	Files
Added a unit test for empty string input in parse_blocks	Defined test_parse_blocks_empty() Asserted parse_blocks("") == []	nixie/unittests/test_parse_blocks.py

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[sourcery-ai]

Hey @leynos - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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