Provide more fine grained error responses if a request for a user fails

[NicMcPhee]

Currently when UserProfileComponent displays the user, it checks for an error and displays the error information (see #1442), but there's no checking for the details of the specific status code that is returned. A question is whether we want to add logic somewhere that checks for the specifics of an error for the server, and provides a more customized response for the user.

My immediate sense is that this probably isn't a high priority because a failure to get a user back from the server is probably due to a programming problem, either in the client or in the server, and the typical user has no ability to address either type of error.