Improvement: gcode with no extrusion shouldn't have a warning

[Terandium]

Every time I start my bed calibration g-code script, which has NO extrusion at all.
I get a warning about it missing filament/spool metadata.

This isn't an issue on its own, however, ContinuousPrint has created some neat integration with this plugin.
This causes my bed calibration script to fail as it's saying something went wrong with getting the metadata.

The ContinousPrint issue

Potential fix? Create a separate warning if a file contains no extrusion at all. Or completely ignore it, as that is the expected behavior.

A spool is selected for tool 0, but I think it goes wrong based on the fact that tool 0 isn't being used in the entire g-code.
Tool 0 being the extruder

[github-actions]

This issue has been automatically marked for closing, because it has not had activity in 30 days. It will be closed if no further activity occurs in 10 days.

[github-actions]

This issue was closed, because it has been already marked for 10 days with no activity.