[BZ#783011] allow setting quantity without number, e.g. ad libitum
Submitted by NikoKrause
Link to original bug (#783011)
Description
Gnome recipe version is 1.4.4-3-g4d4c764e
The quantity has to be a number. Sometimes you just want to say, use "ad libitum" (?!), i.e. as much as you like. (Often used for spices)