Issue/462 android parameter error

[DennisAlund]

Fix Android crash in setUserData when null values are passed over the MethodChannel (reported in #462).

• Filters out null user-data fields on the Dart side before invoking the platform method.
• Makes Android createBundleFromMap null-safe by skipping null entries to prevent NPEs.
• Adds unit tests covering setUserData payload behavior (ensures no null values are sent) and a regression test for the crash scenario.

Fixes #462

[Copilot]

Pull request overview

This PR fixes an Android crash (issue #462) that occurs when null values are passed to setUserData through the MethodChannel. The fix implements a defense-in-depth approach by filtering out null values on the Dart side before sending them to the platform, and making the Android createBundleFromMap method null-safe to gracefully handle any null values that might slip through.

Key changes:

• Dart-side null filtering using the existing _filterOutNulls helper for setUserData
• Android type signature updates to accept nullable values (Map<String, Any?>)
• Explicit null handling in Android's createBundleFromMap with an empty when branch
• Comprehensive unit tests covering null field handling and regression scenarios

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lib/facebook_app_events.dart	Applies _filterOutNulls to setUserData arguments before invoking platform method
android/.../FacebookAppEventsPlugin.kt	Updates type signatures to Map<String, Any?>, adds null case handling in createBundleFromMap, improves error message formatting
test/facebook_app_events_test.dart	Adds three comprehensive tests for setUserData null handling behavior
.gitignore	Consolidates ephemeral directory pattern to root gitignore
example/.gitignore	Removes iOS-specific ephemeral pattern (now covered by root gitignore)

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