When setting a FontFamily on RadEntry, and the font family resource cannot be found, you'll be presented with an exception:

"Value cannot be null.
Parameter name: descriptor"

Stack Trace:

at UIKit.UIFont._FromDescriptor (UIKit.UIFontDescriptor descriptor, System.nfloat pointSize) [0x00011] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.8.0.20/src/Xamarin.iOS/UIKit/UIFont.g.cs:106