WIP: zc.recipe.egg: make 'interpreter' usable even when 'scripts' value is empty
This commit may be the wrong way, because recipes should never distinguish values between
None, simply because the buildout syntax has nothing to restore
None when overriding. Which means that we should find something else to express "no script at all" or "default scripts".
A workaround is to put a dummy
scripts value. The problem is that the recipe (and perhaps more generally
zc.buildout.easy_install.scripts) should raise if a requested script can't be installed.