fix: ignore empty or nil keys in Node#send_keys

[myabc]

Problem

Capybara::Cuprite::Node#send_keys raises on empty or nil keys, diverging from the Selenium and rack_test drivers which treat them as a no-op:

input.send_keys("")   # => ArgumentError: empty keys passed
input.send_keys(nil)  # => ArgumentError: unexpected argument

send_keys forwards straight to Ferrum::Keyboard#type, which rejects empty/nil input. This breaks otherwise driver-agnostic Capybara code such as send_keys(value) where value may be "" — common when conditionally clearing or filling a field. Callers currently have to add their own send_keys(x) if x guards for Cuprite only.

Real world example: https://github.com/citizensadvice/capybara_accessible_selectors/pull/157/changes#diff-8a7441fcb90a95d9647b64ef89630240641dfb8cd8d88ea3d4768d4053e8af5aR75

Fix

Reject nil and "" entries before delegating to Ferrum, and no-op when nothing remains. Meaningful keys (including symbols like :enter and modifier chords like [:control, "a"]) pass through unchanged, and empty strings mixed with real keys are dropped rather than crashing.

Testing

New spec in the "has ability to send keys" context asserts send_keys("") and send_keys(nil) do not raise and leave the field unchanged. Full send_keys context green (25 examples). Rubocop clean.

[Copilot]

Pull request overview

This PR aligns Capybara::Cuprite::Node#send_keys behavior with Capybara’s Selenium and rack_test drivers by treating nil and empty-string key inputs as a no-op instead of raising, improving driver-agnostic test/code portability.

Changes:

• Filter out nil and "" entries in Node#send_keys, and return early when no keys remain.
• Add a feature spec asserting send_keys("") and send_keys(nil) do not raise and do not change the field value.
• Document the behavior change in the changelog.

Reviewed changes

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

File	Description
lib/capybara/cuprite/node.rb	Filters out nil/empty keys before delegating, avoiding Ferrum exceptions and no-op’ing when nothing remains.
spec/features/driver_spec.rb	Adds coverage ensuring empty/nil send_keys inputs do not raise and do not mutate the field.
CHANGELOG.md	Notes the fixed behavior for Node#send_keys in Unreleased.

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