allow None for rssi, add a missing newline to fakes.py

pyHS100/tests/fakes.py

@@ -265,6 +265,7 @@ sysinfo_lb110 = {'system': {
          }
 }}
 
+
 def error(cls, target, cmd="no-command", msg="default msg"):
     return {target: {cmd: {"err_code": -1323, "msg": msg}}}
 

pyHS100/tests/test_pyHS100.py

@@ -59,7 +59,7 @@ class TestSmartPlugHS110(TestCase):
         'oemId': str,
         'on_time': int,
         'relay_state': int,
-        'rssi': int,  # apparently rssi can also be positive, see #54
+        'rssi': Any(int, None),  # rssi can also be positive, see #54
         'sw_ver': str,
         'type': str,
         'mic_type': str,