dataconvert updates

soleprint/station/tools/dataconvert/output.py

@@ -29,6 +29,9 @@ def write_tables(dfs: dict, out_dir: Path, source_name: str, max_rows=None, repo
         filename = table_filename(raw_name, source_name, len(dfs), bare_prefixes)
         sql, total, full_bytes, exact = render_table(df, table, max_rows)
         out_file = out_dir / filename
+        # Created on the first file, so a run that finds nothing to convert
+        # leaves no empty directory behind.
+        out_dir.mkdir(parents=True, exist_ok=True)
 
         # Several sources can feed the same table; they accumulate in one file.
         mode = "a" if out_file.exists() else "w"