Add error handling to improve user experience 56/456/7
authorLott, Christopher (cl778h) <cl778h@att.com>
Fri, 28 Jun 2019 12:17:04 +0000 (08:17 -0400)
committerLott, Christopher (cl778h) <cl778h@att.com>
Fri, 5 Jul 2019 12:44:55 +0000 (08:44 -0400)
Add front-end error handlers to indicate when data
could not be fetched, which explains an empty table.
Revise back-end error handling to reduce lines of code;
add a central ControllerAdvice class that catches any
HttpStatusCodeException and generates a JSON response.

Change-Id: I434e602a89d05ed4de13cddc31633970aa2c8e5d
Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>

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