Error message in case of no IDT name for monomer is wrong

[AlexeyGirin]

Steps to Reproduce

1. Switch to Macro
2. Load from file: Error message in case of no IDT name for monomer is wrong.zip OR create on the canvas followng configuration:
3. Try to export canvas to IDT

Actual behavior System throws an error: Convert error! Sequence saver: IDT alias for group sugar:5formD base:form5C phosphate:cm not found.

Expected behavior System throws an error: This molecule has unsupported monomer and couldn't be exported to IDT notation

As per requirement:

If there is no IDT name for monomer, system should display Error message "This molecule has unsupported monomer and couldn't be exported to IDT notation".

Versions:

• Indigo Toolkit Version 1.21.0-rc.1.0-g9194599b2-wasm32-wasm-clang-19.0.0
• Ketcher Version 2.22.0-rc.2 Build at 2024-06-03; 18:43:00
• Chrome Version 125.0.6422.142 (Official Build) (64-bit)
• Windows 10

Issue found while testing https://github.com/epam/Indigo/issues/1900

[Zhirnoff]

Automated.