Update UnityAdsRewardItem.m

changed these to just nil checks to avoid downstream crashes from not properly handling nil data.
Allow unsupported platforms to be build under Unity with an external shim
Merge branch 'malfor-data-fix' of https://github.com/scopely/unity-ads into scopely-malfor-data-fix
Fail gracefully on invalid server-side zone configuration
Merge branch 'scopely-malfor-data-fix'
Log warnings in all cases
Use a more robust way to wait for webview to finish loading
Bump version number to 1.3.3
Allow build.sh to do debug builds on Android
Add missing default show overload to Unity API
Restore human readable stack traces
Fix productType for tests
Merge branch 'master' of https://github.com/Applifier/unity-ads
Fix incomplete zone parser test
Only remove delegates on destroy when its the shared instance
Remove (Clone) strings inserted to the GameObject name by Unity in certain cases
Showing ads requires connected network
Merge branch 'master' of https://github.com/Applifier/unity-ads
Fix timer crash
Proper null checking when checking if activity is debuggable