Fixed index out of bounds

tools/rpi/hoymiles/decoders/__init__.py

@@ -154,6 +154,7 @@ class StatusResponse(Response):
         while s_exists:
             s_exists = False
             string_id = len(strings)
+            if string_id < len(self.inv_strings):
               string = {}
               string['name'] = self.inv_strings[string_id]['s_name']
               for key in self.string_keys: