Safely check the global appName and handle its inexistence #2028
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Variable is set -> default is used, developers can overwrite the prop value
Variable is not set -> prop become required
Right now you can't use the AppContent without the global variable, because the code that sets the default is always evaluated and will throw a ReferenceError before the developer can even specify their own value. Ref nextcloud/mail#5165 (comment).
Then we can avoid hacks like nextcloud/spreed@c662744
The code is untested because neither @GretaD nor I can build this library at the moment.