[tex-hyphen] zerohyph left/right should not be empty

[Arthur Rosendahl]

	Hi Karl,

On Tue, May 18, 2021 at 02:38:42PM -0600, Karl Berry wrote:
> Arthur or anyone - please change your texhyphen tlpsrc generation so
> that the values for the zerohyph languages (arabic, farsi) are zero, not
> the empty string. Just for cleanliness.

  Thanks for the report, I’ll change the empty values to zero.

	Best,

		Arthur