Create fewer unnecessary lists

pkg/analyzer/lib/src/generated/java_core.dart

Index: pkg/analyzer/lib/src/generated/java_core.dart
diff --git a/pkg/analyzer/lib/src/generated/java_core.dart b/pkg/analyzer/lib/src/generated/java_core.dart
index 011c4ebc17a19b38013ba7151d6372a4ff41cca9..9c86f235667495c9323ed111382f96bf6bd7b38f 100644
--- a/pkg/analyzer/lib/src/generated/java_core.dart
+++ b/pkg/analyzer/lib/src/generated/java_core.dart
@@ -420,11 +420,14 @@ String format(String pattern, [arg0, arg1, arg2, arg3, arg4, arg5, arg6, arg7])
  *     format('{0} are you {1}ing?', ['How', 'do']) = 'How are you doing?'
  *     format('{0} are you {1}ing?', ['What', 'read']) = 'What are you reading?'
  */
-String formatList(String pattern, List args) {
+String formatList(String pattern, List<Object> arguments) {
+  if (arguments == null || arguments.isEmpty) {
+    return pattern;
+  }
   return pattern.replaceAllMapped(new RegExp(r'\{(\d+)\}'), (match) {
     String indexStr = match.group(1);
     int index = int.parse(indexStr);
-    var arg = args[index];
+    Object arg = arguments[index];
     return arg != null ? arg.toString() : null;
   });
 }