Fix HTML rendering to handle nil values without removing sibling elements

[askonomm]

This pull request improves the handling of nil values in node hierarchies within the dompa library, ensuring that nil entries do not inadvertently remove or affect sibling nodes when converting node trees to HTML. It also adds comprehensive tests to verify this behavior.

Nil handling improvements:

• Updated nodes-from-opt in src/dompa/nodes.cljc to explicitly handle nil values, ensuring they do not propagate into node children lists.
• Modified node construction logic in src/dompa/nodes.cljc to remove nil children and ensure the children vector only contains valid nodes.
• Changed the HTML rendering fallback in nodes->html-fn to return the current html string instead of an empty string for unmatched cases, preventing accidental removal of siblings when encountering nil.

Testing improvements:

• Added nil-in-hierarchy-does-not-remove-siblings-test in test/dompa/nodes_test.cljc to verify that nil values do not affect sibling elements or their HTML output in various scenarios.

[codescene-delta-analysis]

Gates Passed
4 Quality Gates Passed

See analysis details in CodeScene

Quality Gate Profile: Clean Code Collective
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