Layout and Save to RXN/RDF works not correctly when Multi-Tailed Arrow is on canvas without elements near tails or head, If no elements are near multi-tailed arrow, layout action should consider it as empty elements

**Steps to Reproduce Case 1**
1. Add Multi-Tailed Arrow with 3 tails:
2. Click on Layout

**Actual behavior**
- Arrow appears, Multi-Tailed Arrow is moved:

**Expected behavior**
- Multi-Tailed arrow is moved to the center and size is changed to default for indigo (https://github.com/epam/Indigo/issues/2309)

3. Click one more time - multi-tailed arrow disappears, the arrow is moved to the center

**Steps to Reproduce Case 2**
1. Add Multi-Tailed Arrow with 3 tails, add benzene rings, leave two tails without elements:
2. Click on Layout

**Actual behavior**
- Arrow appears, Multi-Tailed Arrow is moved:

**Expected behavior**
- Multi-Tailed arrow is moved to the center with elements and size of arrow is changed to default for indigo:

3. Click one more time - multi-tailed arrow disappears, the arrow is moved to the center

**Steps to Reproduce Case 3**
1. Add Multi-Tailed Arrow with 3 tails, add elements and single arrow:
2. Click on Layout

**Actual behavior**
- Multi-Tailed Arrow disappear:

**Expected behavior**
- Multi-Tailed arrow is moved to the center with elements and size of arrow is changed to default for indigo

**Environment details**
- Tested on CI-CD 2237-detect-pathway SA environment
- Ketcher [Version 2.25.0-rc.2] Build at 2024-09-24; 02:30:35
- Indigo Version 1.25.0-dev.1.58-ga966745f-wasm32-wasm-clang-12.0.0
- Windows 11 Enterprise
- Chrome Version 129.0.6668.59 (Official Build) (64-bit)

**Notes**
- Test cases are added to xls for RDF, RXN and Layout and should be automated
- This fix is affected save to RXN/RDF as well, for example a case with Cascade reaction:
1. Add a reaction from the KET file:
[1-cascade-branches-ordering.zip](https://github.com/user-attachments/files/17247272/1-cascade-branches-ordering.zip)
2. Add an additional tail to any multi-tailed arrow:
3. Click on save to RDF - there is a 6:4 reaction that's not correct, all elements shouldn't be united:
- Issue is detected during exploratory testing of Import/Export of Multi-Tailed Arrow in cascade reactions - https://github.com/epam/Indigo/issues/2236