MAINT: remove un-reachable codepath.

Removes conditional after a return statement.

Author: rossbar

numpydoc/docscrape_sphinx.py

@@ -52,10 +52,6 @@ def _str_indent(self, doc, indent=4):
 
     def _str_signature(self):
         return ['']
-        if self['Signature']:
-            return ['``%s``' % self['Signature']] + ['']
-        else:
-            return ['']
 
     def _str_summary(self):
         return self['Summary'] + ['']