Fix regression when using empty/nil properties with array filters

[ianks]

Fixed a regression where empty properties like {{ array | where: '' }} would return an empty array. Now both empty strings and nil properties act as no-ops, simply returning the original array. This makes the library more forgiving when properties are missing or blank, reducing unexpected errors in your templates.

[Copilot]

Pull Request Overview

This PR fixes a regression with array filters ensuring that empty strings and nil properties act as no-ops rather than producing errors. Key changes include:

• Updated tests for the map and where filters to verify that nil and empty string properties return the original array unchanged.
• Adjusted the map filter and the internal filter_array helper in the standard filters to handle empty properties as no-ops.
• Bumped the library version from 5.8.2 to 5.8.3.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
test/integration/standard_filter_test.rb	Updated tests to assert no-op behavior when array filters are given nil/empty property values.
lib/liquid/version.rb	Updated version to reflect the patch release.
lib/liquid/standardfilters.rb	Modified map filter to immediately return the input for an empty property, and adjusted filter_array to remove an early return for empty properties.

Comments suppressed due to low confidence (2)

lib/liquid/standardfilters.rb:995

• Ensure that the removal of the early return for empty properties in filter_array is intentional; consider adding an inline comment to clarify that an empty property is now handled as a no-op to align with the updated behavior in other filters.

property = Utils.to_s(property)

test/integration/standard_filter_test.rb:588

• Consider adding test cases for the sum filter (which uses filter_array) with nil or empty properties to ensure consistent no-op behavior across all array filters.

assert_equal(input.flatten, result)

[ianks]

Verified this against shadowed traffic and things look fine, this should be good to go