IO-3468 Add sentry exceptions & minor nul coalesce fixes.

client/src/utils/sentry.js

@@ -31,7 +31,8 @@ if (!import.meta.env.DEV) {
       "Module specifier, 'fs' does not start",
       "Module specifier, 'zlib' does not start with",
       "Messaging: This browser doesn't support the API's required to use the Firebase SDK.",
-      "Failed to update a ServiceWorker for scope"
+      "Failed to update a ServiceWorker for scope",
+      "Network Error"
     ],
     integrations: [
       // See docs for support of different versions of variation of react router