Empty line in panel to number with simple substraction issue

Left panel with the ‘B’ header and one number and one empty line.
It look me some time to find this empty ligne, brealing my code only on the SD plateforme (working offline)
SD output report and empty string when toogle id off:
I’m using SD Rhino 6 version with Rhino’s SD plugin 1.11.0 version. There is a minimal definition:
empty-line issue.gh (10.5 KB)
Could you fix it to have the same behavior as offline GH data type conversion / cleaning ?

I opened the definition in Rhino 6, and it fails there as well, which explains why it fails on the Rhino 6 servers. The only options here are to sanitize your strings or switch to a Rhino 7 server.