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
frontend cleanup
fixed loading uploaded graph data
backend cleanup
modified showGraph JSP to use JSTL and EL
Zobrazit revize
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