fdo#59249: mailmerge.py: adapt to changes in smtplib:

Apparently the login() method in Python 3.3 expects str arguments for
user and password, since it calls encode on them, but for Python 2.6 the
"encode" calls were explicitly added in the caller since login() does
not encode itself; add an ugly version check for that.

Change-Id: Iebfce44073a837e9cb845855ba448d5b6a2ebd11

scripting/source/pyprov/mailmerge.py

@@ -99,9 +99,12 @@ class PyMailSMTPService(unohelper.Base, XSmtpService):
 			self.server.starttls()
 			self.server.ehlo()
 
-		user = xAuthenticator.getUserName().encode('ascii')
-		password = xAuthenticator.getPassword().encode('ascii')
-		if user != b'':
+		user = xAuthenticator.getUserName()
+		password = xAuthenticator.getPassword()
+		if user != '':
+			if sys.version < '3': # fdo#59249 i#105669 Python 2 needs "ascii"
+				user = user.encode('ascii')
+				password = password.encode('ascii')
 			if dbg:
 				print("Logging in, username of", user, file=dbgout)
 			self.server.login(user, password)
@@ -279,9 +282,12 @@ class PyMailIMAPService(unohelper.Base, XMailService):
 			self.server = imaplib.IMAP4(server, port)
 		print("AFTER", file=dbgout)
 			
-		user = xAuthenticator.getUserName().encode('ascii')
-		password = xAuthenticator.getPassword().encode('ascii')
-		if user != b'':
+		user = xAuthenticator.getUserName()
+		password = xAuthenticator.getPassword()
+		if user != '':
+			if sys.version < '3': # fdo#59249 i#105669 Python 2 needs "ascii"
+				user = user.encode('ascii')
+				password = password.encode('ascii')
 			if dbg:
 				print("Logging in, username of" + user, file=dbgout)
 			self.server.login(user, password)
@@ -348,8 +354,11 @@ class PyMailPOP3Service(unohelper.Base, XMailService):
 			self.server = poplib.POP3(server, port)
 		print("AFTER", file=dbgout)
 			
-		user = xAuthenticator.getUserName().encode('ascii')
-		password = xAuthenticator.getPassword().encode('ascii')
+		user = xAuthenticator.getUserName()
+		password = xAuthenticator.getPassword()
+		if sys.version < '3': # fdo#59249 i#105669 Python 2 needs "ascii"
+			user = user.encode('ascii')
+			password = password.encode('ascii')
 		if dbg:
 			print("Logging in, username of" + user, file=dbgout)
 		self.server.user(user)