LibGD v2.3.0 has a bug that is breaking font.rb

[krunde-nextpoint]

In LibGD v2.3.0 they added a "feature" so you cannot draw a blank string. This is often used to check if a font exists. gd2-ffij uses it in font.rb line 215:
r = ::GD2::GD2FFI.send(:gdImageStringFTEx, *args)

This is an issue in LibGD and they have a fix, but have released a new version yet: libgd/libgd#615

Since Homebrew is on version 2.3.0 this has been causing us an issue testing locally. We did a monkey patch that replaces the error on line 219 from
raise FreeTypeError.new(r.read_string) unless r.null?
to
raise FreeTypeError.new(r.read_string) unless r.null? || r.read_string == 'Problem doing text layout'
In order to get around this for now until a new version of LibGD comes out. You probably don't want to add that to your main code so I am not submitting a PR for this. Just wanted to make it easy for others to find if they hit the same issue.

This shows up as the following error message:
Problem doing text layout