allow ingredients withou amount

[mkaut]

In many recipes, the amount of seasoning (salt, pepper, etc) is often unspecified, with the understanding that this means "according to your taste".
If I do this in the Cookbook, the ingredient gets marked with an exclamation mark and a warning that it cannot be recalculated - which i only annoying - it is kind of obvious that if there is no number, it does not get recalculated, there is no need for a warning.

Could we get an option for removing the warning?