Fix potential mutable dict issue (#44)

custom_components/healthchecksio/config_flow.py

@@ -1,11 +1,12 @@
 """Adds config flow for Blueprint."""
-import async_timeout
 import asyncio
 from collections import OrderedDict
+
+import async_timeout
 import voluptuous as vol
+from homeassistant import config_entries
 from homeassistant.helpers.aiohttp_client import async_get_clientsession
 from integrationhelper import Logger
-from homeassistant import config_entries
 
 from .const import DOMAIN, DOMAIN_DATA, OFFICIAL_SITE_ROOT
 
@@ -22,9 +23,7 @@ def __init__(self):
         self._errors = {}
         self.initial_data = None
 
-    async def async_step_user(
-        self, user_input={}
-    ):  # pylint: disable=dangerous-default-value
+    async def async_step_user(self, user_input=None):
         """Handle a flow initialized by the user."""
         self._errors = {}
         if self._async_current_entries():
@@ -78,9 +77,7 @@ async def _show_initial_config_form(self, user_input):
             step_id="user", data_schema=vol.Schema(data_schema), errors=self._errors
         )
 
-    async def async_step_self_hosted(
-        self, user_input={}
-    ):  # pylint: disable=dangerous-default-value
+    async def async_step_self_hosted(self, user_input):
         """Handle the step for a self-hosted instance."""
         self._errors = {}
         valid = await self._test_credentials(