Prevent ingredient warning for headings

[christianlupus]

I find the quantity conversion of the ingredient fields very good. But: Can a code for the beginning of the line (e.g. the existing ##) be taken into account that this line is excluded from the recalculation, that this is a heading line or description line between the ingredients, for which there is also no error message that it cannot be converted?
Thanks!

Originally posted by @neidert in #1561 (comment)

[j0hannesr0th]

@christianlupus shall I do this one as describe in the discussion?

[christianlupus]

Yes, of you like, that would be very good. I will sign you to it.