Export of unresolved monomer to everything except KET and IDT should cause specific error message (but it doesn't)
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- C++
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Description
**Steps to Reproduce**
1. Go to Macromolecules mode - Flex mode
2. Load using paste from clipboard IDT type: `/i2AmPr/`
3. Try to save canvas to Mol v2000 (and others unsupported - SDF v2000, SDF v3000, Daylight SMARTS, HELM)
**Actual behavior**
- [ ] Mol v2000 - Not fixed.
- [ ] SDF v2000 - Not fixed
- [ ] SDF v3000 - Not fixed
- [ ] Daylight SMARTS - Not fixed
- [ ] RXN v3000 - Not fixed
**Expected behavior**
System shows an error: Monomer /i2AmPr/ couldn't be saved to MDL Molfile V3000 format
As per [requirements](https://github.com/epam/ketcher/issues/4431):
```
4. Attempt to save macromolecules with unknown monomers to file formats other than IDT and KET should result in error.
"Monomer /.../ couldn't be saved to .... format"
```
**Versions**
- Ketcher Version 2.27.0-rc.2 Build at 2024-11-12; 19:26:10
- Indigo Toolkit Version 1.26.0-rc.2.0-gfec30ecd8-wasm32-wasm-clang-19.0.0
- Chrome Version 131.0.6778.70 (Official Build) (64-bit)
- Win10
Issue found while testing - https://github.com/epam/ketcher/issues/4431
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