Fix some IDE warnings, mostly around type safety on the Python side

spothole.py

@@ -29,13 +29,14 @@ cleanup_timer = None
 run = True
 
 
-def shutdown(sig, frame):
+def shutdown(_signum=None, _frame=None):
     """Shutdown function"""
 
     global run
 
     logging.info("Stopping program...")
-    web_server.stop()
+    if web_server:
+        web_server.stop()
     for sp in spot_providers:
         if sp.enabled:
             sp.stop()
@@ -45,8 +46,10 @@ def shutdown(sig, frame):
     for scp in solar_condition_providers:
         if scp.enabled:
             scp.stop()
-    cleanup_timer.stop()
-    lookup_helper.stop()
+    if cleanup_timer:
+        cleanup_timer.stop()
+    if lookup_helper:
+        lookup_helper.stop()
     spots.close()
     alerts.close()
     solar_conditions_cache.close()