[Bug] Textbox link (dashed lines) lead to empty space when no label is provided for LengthTool Annotation

[MamoonAhmad]

Describe the Bug

Drawing annotations where every annotation has a textbox label except for one. Then, that one annotation without label has a dashed line leading to empty textbox. Which looks really weird.
This is also a problem if we want to hide annotation labels for all the other annotations except one. (This is a business use case we are trying to solve).

Steps to Reproduce

• Add multiple Line annotations using the length tool.
• do not add label for textbox for some of the annotations.

The current behavior

LengthTool draws textbox links to annotations which does not have a label. Which draws a dashed line to an empty space.

The expected behavior

The annotation without the label should not have a textbox link or empty textbox.
It should exit the function early just like all the other annotation tools.

Some examples

https://github.com/cornerstonejs/cornerstone3D/blob/main/packages/tools/src/tools/annotation/PlanarFreehandROITool.ts#L1091

https://github.com/cornerstonejs/cornerstone3D/blob/main/packages/tools/src/tools/annotation/SplineROITool.ts#L1060

System Information

System:
OS: MacOS Tahoe 26.2
CPU: Apple M3 Pro
Memory: 18 GB
Binaries:
Node: 25.9.0
Yarn: 1.22.22
npm: 11.12.2
Browsers:
Chrome: 147.0.7727.138

[linear]

CS-157