SaveDiagram and RemoveDiagram servlets validate diagram_id parameter for both null and empty string
Login and Register servlets return details on why the request failed
fixed isLoggedIn method to be null-proof
minor servlet improvements
modified servlet to use helper methods from BaseServlet
fixed LoadGraphData servlet not to delete JSON from session which caused failure on page reload
backend cleanup
fixed redirect from upload to graph screen to use base app URL
modified RemoveDiagram servlet to use HTTP method DELETE instead of POST
reworked upload screen
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