skip non-existing

Author: rjernst

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/transport/TransportVersionResourcesService.java

@@ -101,6 +101,9 @@ Map<String, TransportVersionDefinition> getNamedDefinitions() throws IOException
         Map<String, TransportVersionDefinition> definitions = new HashMap<>();
         // temporarily include unreferenced in named until validation understands the distinction
         for (var dir : List.of(NAMED_DIR, UNREFERENCED_DIR)) {
+            if (Files.exists(dir) == false) {
+                continue;
+            }
             try (var definitionsStream = Files.list(transportResourcesDir.resolve(dir))) {
                 for (var definitionFile : definitionsStream.toList()) {
                     String contents = Files.readString(definitionFile, StandardCharsets.UTF_8).strip();