wrong generation of `language.dat` and friends?

[Werner LEMBERG]

Looking at the most recent git commits I see changes like this (in
`language.dat.lua`):

```
 -- from hyphen-arabic:
 	['arabic'] = {
 		loader = 'zerohyph.tex',
-		lefthyphenmin = 2,
-		righthyphenmin = 3,
+		lefthyphenmin = ,
+		righthyphenmin = ,
 		synonyms = {  },
 		patterns = '',
 	},
```

or that (in `language.def`):

```
 % from hyphen-arabic:
-\addlanguage{arabic}{zerohyph.tex}{}{2}{3}
+\addlanguage{arabic}{zerohyph.tex}{}{}{}
```

I think this is incorrect, since executing `fmtutil-user --all`
reports failed format builds.


   Werner