refac:avoiding of have default value for useSubdomains and isDataResidency flags

Author: MahdiZTD

Adjust/example-app-java/src/main/java/com/adjust/examples/GlobalApplication.java

@@ -65,11 +65,12 @@ public void onFinishedEventTrackingSucceeded(AdjustEventSuccess eventSuccessResp
             }
         });
 
+
+        // Set url strategy
 //        List<String> urlStrategy = new ArrayList<>();
 //        urlStrategy.add("adjust.com");
 //        urlStrategy.add("adjust.cn");
 //        urlStrategy.add("eu.adjust.com");
-//
 //        config.setUrlStrategy(urlStrategy , true, false);
 
         // Set event failure tracking delegate.

Adjust/sdk-core/src/main/java/com/adjust/sdk/AdjustConfig.java

@@ -165,10 +165,12 @@ public void setUrlStrategy(List<String> domains, Boolean useSubdomains ,Boolean
             return;
         }
         if (useSubdomains == null) {
-            useSubdomains = false;
+            logger.error("useSubdomains cannot be null");
+            return;
         }
         if (isDataResidency == null) {
-            isDataResidency = false;
+            logger.error("isDataResidency cannot be null");
+            return;
         }
         this.urlStrategy = domains;
         this.useSubdomains = useSubdomains;