refactor: simplify attribution info handling and improve error reporting in RNIterableAPI

Author: lposen

ios/RNIterableAPI/ReactIterableAPI.swift

@@ -159,10 +159,6 @@ import React
   @objc(setAttributionInfo:)
   public func setAttributionInfo(attributionInfo dict: NSDictionary?) {
     ITBInfo()
-    guard let dict = dict else {
-      IterableAPI.attributionInfo = nil
-      return
-    }
     guard let swiftDict = dict as? [AnyHashable: Any] else {
       IterableAPI.attributionInfo = nil
       return
@@ -377,6 +373,7 @@ import React
     ITBInfo()
     guard let message = IterableAPI.inAppManager.getMessage(withId: messageId) else {
       ITBError("Could not find message with id: \(messageId)")
+      rejecter("", "Could not find message with id: \(messageId)", NSError(domain: "", code: 0, userInfo: nil))
       return
     }
     IterableAPI.inAppManager.show(message: message, consume: consume) { (url) in
@@ -391,6 +388,7 @@ import React
     ITBInfo()
     guard let message = IterableAPI.inAppManager.getMessage(withId: messageId) else {
       ITBError("Could not find message with id: \(messageId)")
+      rejecter("", "Could not find message with id: \(messageId)", NSError(domain: "", code: 0, userInfo: nil))
       return
     }
     if let inAppDeleteSource = InAppDeleteSource.from(number: sourceNumber as NSNumber) {