[webview_flutter_wkwebview] Fixes bug where WebkitWebViewController.getUserAgent
was incorrectly returning an empty String
#5062
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It seems that WKWebView.customUserAgent is never actually set to nil. It was always an empty String. Even after attempting to set the value to nil, the value would always return as an empty String. This is in contrary to the documentation for the property.
I'm not sure if this is based on the iOS version, so this PR checks if the value is null or is empty.
Fixes flutter/flutter#135813
Pre-launch Checklist
dart format
.)[shared_preferences]
pubspec.yaml
with an appropriate new version according to the pub versioning philosophy, or this PR is exempt from version changes.CHANGELOG.md
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