sqlpage.fetch(null) = null

[lovasoa]

Make sqlpage.fetch(null) and sqlpage.fetch_with_meta(null) return null instead of throwing an error.

This aligns their behavior with other SQLPage functions that return null when provided with a null input, improving consistency.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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