Fixes PokemonGoF#5883

This fixes an issue when you have a brand new account (no stardust yet)
and run the bot. This makes sure the key is there before we do something
with it.

pokemongo_bot/__init__.py

@@ -72,11 +72,17 @@ def player_data(self):
 
     @property
     def stardust(self):
-        return filter(lambda y: y['name'] == 'STARDUST', self._player['currencies'])[0]['amount']
+        dust = filter(lambda y: y['name'] == 'STARDUST', self._player['currencies'])[0]
+        if 'amount' in dust:
+            return dust['amount']
+        else:
+            return 0
 
     @stardust.setter
     def stardust(self, value):
-        filter(lambda y: y['name'] == 'STARDUST', self._player['currencies'])[0]['amount'] = value
+        dust = filter(lambda y: y['name'] == 'STARDUST', self._player['currencies'])[0]
+        if 'amount' in dust:
+            dust['amount'] = value
 
     def __init__(self, db, config):