Another fix for getaddrinfo: don't set host to None if it's empty

Author: 1st1

tests/test_dns.py

@@ -32,8 +32,10 @@ def _test_getaddrinfo(self, *args, **kwargs):
             ex.__context__ = err
             raise ex
         else:
-            if err is None:
-                self.assertEqual(a1, a2)
+            if err is not None:
+                raise err
+
+            self.assertEqual(a1, a2)
 
     def _test_getnameinfo(self, *args, **kwargs):
         err = None

uvloop/loop.pyx

@@ -509,8 +509,6 @@ cdef class Loop:
         if host is not None:
             if not isinstance(host, bytes):
                 raise TypeError('host must be a str or bytes')
-            if host == b'':
-                host = None
 
         fut = self._new_future()