Avoid None returned when loading fitness file

daemon.py

@@ -21029,7 +21029,9 @@ def run_daemon(map_format: str,
     fitness_filename = base_dir + '/accounts/fitness.json'
     httpd.fitness = {}
     if os.path.isfile(fitness_filename):
-        httpd.fitness = load_json(fitness_filename)
+        fitness = load_json(fitness_filename)
+        if fitness is not None:
+            httpd.fitness = fitness
 
     # initialize authorized fetch key
     httpd.signing_priv_key_pem = None

fitnessFunctions.py

@@ -20,6 +20,8 @@ def fitness_performance(startTime, fitness_state: {},
                         debug: bool) -> None:
     """Log a performance watchpoint
     """
+    if fitness_state is None:
+        return
     if 'performance' not in fitness_state:
         fitness_state['performance'] = {}
     if fitness_id not in fitness_state['performance']: