move if statement with least work first

Author: michael-zhao459

datadog_lambda/tracing.py

@@ -69,13 +69,13 @@
 
 
 def _dsm_set_checkpoint(context_json, event_type, arn):
-    if not isinstance(context_json, dict):
+    if not config.data_streams_enabled:
         return
 
-    if context_json and PROPAGATION_KEY_BASE_64 not in context_json:
+    if not isinstance(context_json, dict):
         return
 
-    if not config.data_streams_enabled:
+    if context_json and PROPAGATION_KEY_BASE_64 not in context_json:
         return
 
     try: