Added dedupe logic

Author: chillaq

client/src/main/java/io/split/client/impressions/strategy/ProcessImpressionDebug.java

@@ -19,6 +19,9 @@ public ProcessImpressionDebug(boolean listenerEnabled, ImpressionObserver impres
     @Override
     public ImpressionsResult process(List<Impression> impressions) {
         for(Impression impression : impressions) {
+            if (impression.properties() != null) {
+                continue;
+            }
             impression.withPreviousTime(_impressionObserver.testAndSet(impression));
         }
         List<Impression> impressionForListener =  this._listenerEnabled ? impressions : null;

client/src/main/java/io/split/client/impressions/strategy/ProcessImpressionOptimized.java

@@ -32,6 +32,9 @@ public ProcessImpressionOptimized(boolean listenerEnabled, ImpressionObserver im
     public ImpressionsResult process(List<Impression> impressions) {
         List<Impression> impressionsToQueue = new ArrayList<>();
         for(Impression impression : impressions) {
+            if (impression.properties() != null) {
+                continue;
+            }
             impression = impression.withPreviousTime(_impressionObserver.testAndSet(impression));
             if(!Objects.isNull(impression.pt()) && impression.pt() != 0){
                 _impressionCounter.inc(impression.split(), impression.time(), 1);