Mojom frontend: Correctly handle empty structs in computeVersionInfo()

mojo/dart/packages/_mojo_for_test_only/lib/mojo/test/test_unions.mojom.dart

Index: mojo/dart/packages/_mojo_for_test_only/lib/mojo/test/test_unions.mojom.dart
diff --git a/mojo/dart/packages/_mojo_for_test_only/lib/mojo/test/test_unions.mojom.dart b/mojo/dart/packages/_mojo_for_test_only/lib/mojo/test/test_unions.mojom.dart
index 782c7fd9893483b380576b68f0ca27064633234b..d729230658e11eddd3c405a86e1234d5abb3b1c1 100644
--- a/mojo/dart/packages/_mojo_for_test_only/lib/mojo/test/test_unions.mojom.dart
+++ b/mojo/dart/packages/_mojo_for_test_only/lib/mojo/test/test_unions.mojom.dart
@@ -3441,7 +3441,7 @@ mojom_types.RuntimeTypeInfo  _initRuntimeTypeInfo() {
   // serializedRuntimeTypeInfo contains the bytes of the Mojo serialization of
   // a mojom_types.RuntimeTypeInfo struct describing the Mojom types in this
   // file. The string contains the base64 encoding of the gzip-compressed bytes.
-  var serializedRuntimeTypeInfo = "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";
+  var serializedRuntimeTypeInfo = "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";
 
   // Deserialize RuntimeTypeInfo
   var bytes = BASE64.decode(serializedRuntimeTypeInfo);