Fix clearml-search cli error if dataset version is None (#1329)

Co-authored-by: Vignesh D <vignesh_d@epam.com>

clearml/cli/data/__main__.py

@@ -656,7 +656,7 @@ def ds_search(args):
             formatting.format(
                 d["project"],
                 d["name"],
-                d["version"],
+                d["version"] or "",
                 str(d["tags"] or [])[1:-1],
                 str(d["created"]).split(".")[0],
                 d["id"],