Missing Application Insights env var results in unexpected page render

[Rocket]

Description

While working on #432, I discovered that when the App Insights environment variable is missing, CST displays the following:

This is unexpected.

Acceptance Criteria

• Identify what's going on
• Make any necessary fix so that a missing App Insights env var renders nicely

[Rocket]

@lomky (CC @nicoleslaw @dianagriffin). It turns out that when an error is thrown and we do not catch it, this is what is displayed (see ticket description). Is this an issue we want to fix? I think it's pretty rare, but still possible that we may have uncaught errors and we probably want to display something nicer. If so, can you open a new ticket for it?

Details: It turns out that this throw new Error wasn't getting caught and was resulting in this render.

ui-claim-tracker/utils/logger.ts

Lines 81 to 84 in 72d5437

 log(logFn: LogFunction, mergingObject: object, message: string): void { 
   if (this.pino === undefined) { 
     throw new Error('Pino is undefined') 
   } else { 

[Nicole Fenton]

I can open a ticket on this one. @dianagriffin do you think it makes sense to display the 500 message here even though it's not a 500 error?

Relates to #467

[dianagriffin-zz]

@nicoleslaw I agree that the 500 message is generic enough to make sense/be generally accurate from the user perspective.