- More accurate description of None outcome of _check_fingerprint

 - Check for presence of PyOpenSSL in fingerprint check. Fixes #2841.

src/common/connection.py

@@ -448,7 +448,7 @@ class Connection(ConnectionHandlers):
 			return
 
 		if fpr_good == None:
-			log.warning(_("No fingerprint in database for %s. Connection could be insecure."), hostname)
+			log.warning(_("Unable to check fingerprint for %s. Connection could be insecure."), hostname)
 
 		if fpr_good == True:
 			log.info("Fingerprint found and matched for %s.", hostname)
@@ -458,7 +458,11 @@ class Connection(ConnectionHandlers):
 		return True
 
 	def _check_fingerprint(self, con, con_type):
-		fpr_good = None # None: No fpr in database, False: mismatch, True: match
+		fpr_good = None # None: Unable to check fpr, False: mismatch, True: match
+
+		# FIXME: not tidy
+		import common.xmpp.transports_nb
+		if not common.xmpp.transports_nb.USE_PYOPENSSL: return None
 
 		# FIXME: find a more permanent place for loading servers.xml
 		servers_xml = os.path.join(gajim.DATA_DIR, 'other', 'servers.xml')