[ENHANCEMENT]: Supertask Builder Error handling

[ObsidianOracle]

Description

If you try to create a supertask with the builder and insert certain masks and leave one line empty the supertask wont be created. We should escape this case in the frontend, if a line is empty, just skip it and dont interpret it as a mask.

[s3inlc]

Note: this is only needed if the supertask builder remains executed in the frontend. If we move the builder into a helper in the backend as I proposed, this issue will not be needed anymore.