Merge pull request #183 from mixpanel/jared-handle-nil-super-props

safer handling of nil superProperties

Author: jaredmixpanel

ios/AutomaticProperties.swift

@@ -5,7 +5,7 @@ class AutomaticProperties {
     static var peopleProperties: Dictionary<String, MixpanelType> = [:];
 
     static func setAutomaticProperties(_ properties: [String: Any]) {
-        for (key,value) in properties {
+        for (key,value) in properties ?? [:]  {
             peopleProperties[key] = MixpanelTypeHandler.mixpanelTypeValue(value)
         }
     }