Handle the NoneType case as "AUTO"

Should fix #10

octoprint_portlister/__init__.py

@@ -57,6 +57,10 @@ def do_auto_connect(self, port, *args, **kwargs):
 		try:
 			self._logger.info("do_auto_connect")
 			(autoport, baudrate) = self._settings.global_get(["serial", "port"]), self._settings.global_get_int(["serial", "baudrate"])
+			if not autoport:
+				autoport = "AUTO"
+			if not port:
+				port = "AUTO"
 			if autoport == "AUTO" or os.path.realpath(autoport) == os.path.realpath(port):
 				self._logger.info("realpath match")
 				printer_profile = self._printer_profile_manager.get_default()

setup.py

@@ -5,7 +5,7 @@
 plugin_identifier = "portlister"
 plugin_package = "octoprint_portlister"
 plugin_name = "OctoPrint-PortLister"
-plugin_version = "0.1.7"
+plugin_version = "0.1.8"
 plugin_description = """PortLister notices when printers get turned on and tells the list of ports to refresh"""
 plugin_author = "Mark Walker"
 plugin_author_email = "[email protected]"