We still need to produce a more meaningful error like `xxx was not recognized as a valid SMILES string`
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- C++
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Description
**Steps to Reproduce**
1. Go to Macromolecules mode - Flex mode
2. Load from HELM: `RNA1{[xxx]}$$$$V2.0`

**Actual behavior**
System throws exception: `Convert error! Given string could not be loaded as (query or plain) molecule or reaction, see the error messages: 'SMILES loader: 'x' specifier is allowed only for query molecules'`

**Expected behavior**
System throws exception: `xxx was not recognized as a valid SMILES string`

**Versions**
- Ketcher Version 3.2.0-rc.4 Build at 2025-03-25; 16:50:39
- Indigo Version 1.30.0-rc.4.0-g552c98211-wasm32-wasm-clang-19.0.0
- Chrome Version 134.0.6998.178 (Official Build) (64-bit)
- Win10
Issue found while testing - https://github.com/epam/Indigo/issues/1188
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