Merge pull request #25 from audienceproject/feature/fix-crash-if-no-tracking-param

fix app crash if user did not set NSUserTrackingUsageDescription param

Author: vachumakov

UserReport/UserReport/Models/UserReportUser.swift

@@ -41,6 +41,10 @@ public class UserReportUser: NSObject {
     @objc private func getAdvertisingId() -> String {
         var advertisingId: String = ""
 
+        if Bundle.main.object(forInfoDictionaryKey: "NSUserTrackingUsageDescription") == nil {
+            return advertisingId
+        }
+        
         if UserReport.shared?.anonymousTracking == true {
             return advertisingId
         }