zc.recipe.egg: make 'interpreter' usable even when 'scripts' value is empty

zc.recipe.egg_/src/zc/recipe/egg/egg.py

@@ -161,13 +161,12 @@ class Scripts(Eggs):
         options = self.options
 
         scripts = options.get('scripts')
-        if scripts or scripts is None:
+        interpreter = options.get('interpreter')
+        if scripts != '' or interpreter:
             if scripts is not None:
-                scripts = scripts.split()
-                scripts = dict([
-                    ('=' in s) and s.split('=', 1) or (s, s)
-                    for s in scripts
-                    ])
+                scripts = dict(
+                    s.split('=', 1) if '=' in s else (s, s)
+                    for s in scripts.split())
 
             for s in options.get('entry-points', '').split():
                 parsed = self.parse_entry_point(s)
@@ -190,7 +189,7 @@ class Scripts(Eggs):
                 reqs, ws, sys.executable, options['bin-directory'],
                 scripts=scripts,
                 extra_paths=self.extra_paths,
-                interpreter=options.get('interpreter'),
+                interpreter=interpreter,
                 initialization=options.get('initialization', ''),
                 arguments=options.get('arguments', ''),
                 relative_paths=self._relative_paths,