Add optional=true to nullable @prop in fbandroid/libraries/fresco/vito/litho/src/main/java/com/facebook/fresco/vito/litho/FrescoVitoTapToRetryImageSpec.kt

Reviewed By: ianlevesque

Differential Revision: D107980049

fbshipit-source-id: 5a9ec5fa981235fd29f8e54b5e690a96aef62616

Author: generatedunixname978985251205963

vito/litho/src/main/java/com/facebook/fresco/vito/litho/FrescoVitoTapToRetryImageSpec.kt

@@ -67,7 +67,7 @@ object FrescoVitoTapToRetryImageSpec {
   @OnCreateLayout
   fun onCreateLayout(
       c: ComponentContext,
-      @Prop imageSource: ImageSource?,
+      @Prop(optional = true) imageSource: ImageSource?,
       @Prop(optional = true) fallbackImageSource: ImageSource?,
       @Prop(optional = true) callerContext: Any?,
       @Prop(optional = true, resType = ResType.FLOAT) imageAspectRatio: Float,