Bug when mapping atoms

```
helpers.ts:138 Uncaught TypeError: Cannot read properties of undefined (reading 'idCode')
at N.getDiaIDsMapping (TopicMolecule.ts:452:39)
at MoleculeStructureEditorModal.tsx:75:48
at Object.eI (react-dom.production.min.js:54:315)
at eB (react-dom.production.min.js:54:468)
at react-dom.production.min.js:55:32
at t7 (react-dom.production.min.js:55:119)
at re (react-dom.production.min.js:106:380)
at react-dom.production.min.js:117:104
at oC (react-dom.production.min.js:273:35)
at eM (react-dom.production.min.js:52:368)
at ru (react-dom.production.min.js:109:469)
at nI (react-dom.production.min.js:74:47)
at nO (react-dom.production.min.js:73:69)
at HTMLDivElement.n (helpers.ts:116:16)
```

```

ChemDraw04152512292D

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M END
```