message: better msg for UNL
diff: @@ -26,8 +26,8 @@ export class MolEncoder extends LigandEncoder {
  const atomMap = this.componentAtomData.entries.get(name)!;
  const bondMap = this.componentBondData.entries.get(name)!;
  - // happens for unknown ligands like UNL
  - if (!atomMap) throw Error(`Component ${name} is not registered in the Chemical Component Dictionary`);
  + // happens for the unknown ligands (UNL)
  + if (!atomMap) throw Error(`The Chemical Component Dictionary doesn't hold any atom data for ${name}`);
  let bondCount = 0;
  let chiral = false;
  