Move isEmpty check even earlier

Author: jonatan-ivanov

micrometer-tracing/src/main/java/io/micrometer/tracing/handler/RevertingScope.java

@@ -106,15 +106,15 @@ private static ArrayDeque<BaggageInScope> startBaggageScopes(Tracer tracer, Trac
     }
 
     private static Collection<KeyValue> matchingBaggageKeyValues(Tracer tracer, ContextView context) {
+        if (tracer.getBaggageFields().isEmpty()) {
+            return Collections.emptyList();
+        }
+
         Set<String> lowerCaseRemoteFields = new HashSet<>();
         for (String remoteField : tracer.getBaggageFields()) {
             lowerCaseRemoteFields.add(remoteField.toLowerCase());
         }
 
-        if (lowerCaseRemoteFields.isEmpty()) {
-            return Collections.emptyList();
-        }
-
         Collection<KeyValue> baggageKeyValues = new ArrayList<>();
         for (KeyValue keyValue : context.getAllKeyValues()) {
             if (lowerCaseRemoteFields.contains(keyValue.getKey().toLowerCase())) {