handled KeyError for user prefs

weather.py

@@ -47,6 +47,11 @@ class WeatherApi:
                         'units': 'metric'
                     },
             }
+        except KeyError:
+            user_preferences[nick] = {
+                    'location': None,
+                    'units': 'metric'
+            }
 
         return user_preferences
 
@@ -57,11 +62,18 @@ class WeatherApi:
         if not units or (units and units not in ['metric', 'imperial']):
             units = 'metric'
 
+        try:
             user_preferences[nick]['units'] = units
 
             if location:
                 user_preferences[nick]['location'] = location
 
+        except KeyError:
+            user_preferences[nick] = {
+                    'location': location,
+                    'units': units
+            }
+
         with open(self.user_preferences_filename, 'w') as fp:
             json.dump(user_preferences, fp)
 
@@ -101,7 +113,7 @@ class WeatherApi:
             location = user_preferences[nick]['location']
 
 
-        # URL for current conditions
+        # URL for forecast
         forecast_url = f"{self.weather_api_url}/forecast.json?key={self.api_key}&q={location}&days={days}&qai=no"
 
         # Make the request and get the results