Fix anomalous boot loop when app is in jQuery mode and no SW is registered #1170
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If the app is capable of ServiceWorker mode, but the user has switched to jQuery mode AND the Service Worker is unregistered (e.g. because the user has cleared data for the site), then the new code that initiates the Service Worker messaging causes a boot loop.
This PR fixes that by detecting the situation and showing a dialogue box warning the user that the app won't work offline in the current configuration, suggesting the user switch to ServiceWorker mode.