Clean up empty stubbings directory (#194)

Author: jayantsing-db

src/test/java/com/databricks/jdbc/integration/fakeservice/FakeServiceExtension.java

@@ -220,6 +220,11 @@ private void loadStubMappings(WireMockRuntimeInfo wireMockRuntimeInfo, Extension
     final String stubbingDir = getStubbingDir(context);
     final SingleRootFileSource fileSource = new SingleRootFileSource(stubbingDir + "/mappings");
 
+    if (!fileSource.exists()) {
+      // No stub mappings to load
+      return;
+    }
+
     final List<TextFile> mappingFiles =
         fileSource.listFilesRecursively().stream()
             .filter(byFileExtension("json"))
@@ -308,8 +313,6 @@ private static void deleteFilesInDir(String dirPath) throws IOException {
     Path dir = Paths.get(dirPath);
     if (!Files.exists(dir)) {
       Files.createDirectories(dir);
-      // Stub mappings directory should be tracked by git even if it's empty
-      Files.createFile(dir.resolve(".gitkeep"));
       return;
     }