Fix ACE export

Author: adelavega

ace/export.py

@@ -162,16 +162,17 @@ def export_database(db, foldername, skip_empty=True, table_html=False):
         json.dump(export_md, f)
 
     if table_html:
+        print("Saving!")
         # Save table HTML files if available
         tables_dir = foldername / 'tables'
         tables_dir.mkdir(parents=True, exist_ok=True)
 
         for art in articles:
             art_dir = tables_dir / str(art.id)
-            art_dir.mkdir(parents=True, exist_ok=True)
 
             for t in art.tables:
                 if t.input_html:
+                    art_dir.mkdir(parents=True, exist_ok=True)
                     table_file = art_dir / f"{t.id}.html"
                     with table_file.open('w', encoding='utf-8') as f:
                         f.write(t.input_html)