Remove conditional for epd values <= 0

[michaelhoehn]

NOTE: Depends on

Issues addressed by this PR

Closes #162

Removed the conditional that was catching EPD values <= 0 and throwing an error. Please check all 4 methods that were implementing this check. Mass, Area, Volume, and Length.

Test files

https://burohappold.sharepoint.com/:u:/r/sites/BHoM/02_Current/12_Scripts/02_Pull%20Request/BHoM/LifeCycleAssessment_Toolkit/%23162-Fix%20GWP%20negative%20values/GWP%20negative%20value%20fix.gh?csf=1&web=1&e=tt733W

Changelog

Additional comments

[FraserGreenroyd]

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