Macro: It is not possible to add the built RNA to the canvas when sugar does not contain R3 attachment point

MartaWilliams commented 11 months ago

IMPORTANT: Priority has been rose since attempt to put impossible preset beaks the canvas and causes its complete malfunction

Steps to Reproduce

Go to Ketcher Macromolecules
Click on RNA from the Library on the right and build RNA with sugar with only two AP
examples: 3SS6(nC65C)oxy/ am6(daA)Rsp
Save it and try to add it to the canvas

Actual behavior Is is possible to save preset without bond between sugar and base. It is not possible to add the built RNA to the canvas when sugar does not contain R3 attachment point

https://github.com/epam/ketcher/assets/82752700/adb54745-32ed-416a-93f0-3ee4104081f9

Expected behavior If sugar added to RNA builder doesn't have R2 or R3 AP, OR phosphate doesn't have R1 AP, OR base doesn't have R1 AP, then the Error message should appear and preset should not be saved. Error message:

Selected sugar doesn't have the attachment point to establish bond with the base. (Sugar lacks R3)
Selected sugar doesn't have the attachment point to establish bond with the phosphate. (Sugar lacks R2)
Selected base doesn't have the attachment point to establish bond with the sugar. (Base lacks R1)
Selected phosphate doesn't have the attachment point to establish bond with the sugar. (Phosphate lacks R1)

If defected preset already exists in library, then it could be added to canvas as a group of monomers, but the bonds should be established only between existing AP.