Tweaks the _parse_element and _validate_mode methods, which now both always return a list containing the received strings. Adjusted the props method to use these.
Tweaks the _parse_element and _validate_mode methods, which now both always return a list containing the received strings.
Adjusted the props method to use these.

stadelmanma/OpenPNM,PMEAL/OpenPNM,TomTranter/OpenPNM