Fix PollScaleReportHandle

Author: Quinn-With-Two-Ns

temporal-sdk/src/main/java/io/temporal/internal/worker/PollScaleReportHandle.java

@@ -51,8 +51,9 @@ public synchronized void report(T task, Throwable e) {
     if (task != null) {
       ingestedThisPeriod += 1;
     }
-    ScalingTask.ScalingDecision scalingDecision = task.getScalingDecision();
-    if (scalingDecision != null) {
+
+    if (task != null && task.getScalingDecision() != null) {
+      ScalingTask.ScalingDecision scalingDecision = task.getScalingDecision();
       everSawScalingDecision = true;
       int deltaSuggestion = scalingDecision.getPollRequestDeltaSuggestion();
       logger.info("Poller scaling report.  Delta suggestion: {}.", deltaSuggestion);