TpLink Device Tracker Error (#15918)

* Fix 'Error setting up platform tplink' error when a scanner fails even if another scanner would succeed

* Try to fix tox errors

* Adjust code based on PR comments

homeassistant/components/device_tracker/tplink.py

@@ -69,11 +69,16 @@ class TplinkDeviceScanner(DeviceScanner):
         password = config[CONF_PASSWORD]
         username = config[CONF_USERNAME]
 
-        self.tplink_client = TpLinkClient(
-            password, host=host, username=username)
+        self.success_init = False
+        try:
+            self.tplink_client = TpLinkClient(
+                password, host=host, username=username)
 
-        self.last_results = {}
-        self.success_init = self._update_info()
+            self.last_results = {}
+
+            self.success_init = self._update_info()
+        except requests.exceptions.ConnectionError:
+            _LOGGER.debug("ConnectionError in TplinkDeviceScanner")
 
     def scan_devices(self):
         """Scan for new devices and return a list with found device IDs."""
@@ -115,7 +120,11 @@ class Tplink1DeviceScanner(DeviceScanner):
         self.password = password
 
         self.last_results = {}
-        self.success_init = self._update_info()
+        self.success_init = False
+        try:
+            self.success_init = self._update_info()
+        except requests.exceptions.ConnectionError:
+            _LOGGER.debug("ConnectionError in Tplink1DeviceScanner")
 
     def scan_devices(self):
         """Scan for new devices and return a list with found device IDs."""