don't allow notification service-worker interaction until it is ready

sw_scripts/additional-scripts.js

@@ -18,7 +18,9 @@ function logConsoleAndDb(message, arg1, arg2) {
     self.appendDailyLog(fullMessage);
   } else {
     // sometimes we get the error: "Uncaught TypeError: self.appendDailyLog is not a function"
-    console.log("Not logging to DB because self.appendDailyLog doesn't exist.");
+    console.log(
+      "Not logging to DB (often because self.appendDailyLog doesn't exist).",
+    );
   }
 }