A product with no weight cannot ship or advertise cleanly.

WooCommerce stores shipping weight and dimensions on the product (or on each variation). Blank fields break rate tables and Merchant Center shipping. That is a catalog hole, not a theme bug.

Store Audit — $149 Pro checks on-site — $49/year

Pro (shop zip 1.0.3) lists missing weight and dimensions. Variable parents are skipped where those fields live on variations. Free Catalog Audit on WordPress.org does not include this check.

What to do

1. Open a simple product → Shipping. Fill weight. Fill L × W × H if you charge by size.
2. On variable products, fill the children, not only the parent.
3. Run Catalog Audit Pro, or send WooCommerce → Products → Export for a written Store Audit.

Missing GTIN / brand / MPN · Missing or zero price · Merchant Center feed check