bpo-18540: Fix EAI_NONAME in imaplib.IMAP4*() (GH-8634)

(cherry picked from commit e4dcbbd7f4ac18d01c0ec85f64ae98b8281ed403)

Co-authored-by: Berker Peksag <berker.peksag@gmail.com>
diff --git a/Lib/imaplib.py b/Lib/imaplib.py
index 0dfd852..e451413 100644
--- a/Lib/imaplib.py
+++ b/Lib/imaplib.py
@@ -282,7 +282,11 @@
 
 
     def _create_socket(self):
-        return socket.create_connection((self.host, self.port))
+        # Default value of IMAP4.host is '', but socket.getaddrinfo()
+        # (which is used by socket.create_connection()) expects None
+        # as a default value for host.
+        host = None if not self.host else self.host
+        return socket.create_connection((host, self.port))
 
     def open(self, host = '', port = IMAP4_PORT):
         """Setup connection to remote server on "host:port"
diff --git a/Lib/test/test_imaplib.py b/Lib/test/test_imaplib.py
index f16bacd..a0b598d 100644
--- a/Lib/test/test_imaplib.py
+++ b/Lib/test/test_imaplib.py
@@ -1,6 +1,7 @@
 from test import support
 
 from contextlib import contextmanager
+import errno
 import imaplib
 import os.path
 import socketserver
@@ -69,6 +70,19 @@
         for t in self.timevalues():
             imaplib.Time2Internaldate(t)
 
+    def test_imap4_host_default_value(self):
+        expected_errnos = [
+            # This is the exception that should be raised.
+            errno.ECONNREFUSED,
+        ]
+        if hasattr(errno, 'EADDRNOTAVAIL'):
+            # socket.create_connection() fails randomly with
+            # EADDRNOTAVAIL on Travis CI.
+            expected_errnos.append(errno.EADDRNOTAVAIL)
+        with self.assertRaises(OSError) as cm:
+            imaplib.IMAP4()
+        self.assertIn(cm.exception.errno, expected_errnos)
+
 
 if ssl:
     class SecureTCPServer(socketserver.TCPServer):