Single arrow isn't displayed after loading from RDF reaction without reactants (0:1, 0:2...)

[ivanmaslow]

Steps to Reproduce

1. Add to Canvas reaction 0:1 with 1 product from RDF file:
   !issue-0-1-reaction.zip

Actual Result

• Only molecule is added to Canvas, arrow isn't displayed:
  

Expected Result

• Molecule with an arrow is displayed as it works for loading from RXN:
  
  but in case of loading from RDF arrow should be filled and have appropriate length - Not correct length of head arrow after loading from RDF or layout action #2453:
  

Environment details

• Tested on CI-CD 2237-detect-pathway SA environment
• Ketcher [Version 2.25.0-rc.2] Build at 2024-09-20; 03:00:51
• Indigo Version 1.25.0-dev.1.57-gdf86cde5-wasm32-wasm-clang-12.0.0
• Windows 11 Enterprise
• Chrome Version 129.0.6668.59 (Official Build) (64-bit)

Notes

• Not implemented test case in xls, it should be automated after fixing
• Issue is detected during exploratory testing of Load RDF feature for cascade reactions - Position single elements and reactions, not included to the first cascade reaction #2102