Fix warning when generating coordinates for ZOBs (#5011)
Fix warning when generating coordinates for ZOBs (#5011)

When generating coordinates for molecules with zero order bonds,
the coordgen adapter layer emitted a warning. This addresses that
warning.
bp-kelley/rdkit,bp-kelley/rdkit,rdkit/rdkit,greglandrum/rdkit,rdkit/rdkit,rdkit/rdkit,ptosco/rdkit,bp-kelley/rdkit,ptosco/rdkit,rdkit/rdkit,bp-kelley/rdkit,ptosco/rdkit,greglandrum/rdkit,greglandrum/rdkit,greglandrum/rdkit,ptosco/rdkit,greglandrum/rdkit,ptosco/rdkit,bp-kelley/rdkit,ptosco/rdkit,greglandrum/rdkit,rdkit/rdkit,rdkit/rdkit,bp-kelley/rdkit,bp-kelley/rdkit,bp-kelley/rdkit,ptosco/rdkit,greglandrum/rdkit,rdkit/rdkit,rdkit/rdkit,ptosco/rdkit,greglandrum/rdkit