Made QA changes, extended test plan.

QA Fixes

Added system user check to session LoggedIn method.

Fixed outdating sorting resetting code on report change. Before the fix user would have got an SQL error.

Removed artifacts resulted after adding numberic IDField to every report grid:

In D397#7804, @erik wrote:

Test plan is all right. But, beyond this patch, exists SQL error when doing "View Chart" for "By Product" and "By Section" cases. Problematic SQL is like

SELECT LEFT(c.l1_Name, 60) AS Name, c.CategoryId, SUM() as Metric
   FROM inp_Orders AS o
   LEFT JOIN inp_OrderItems AS od ON od.OrderId = o.OrderId
   LEFT JOIN inp_Products AS p ON p.ProductId = od.ProductId
   LEFT JOIN inp_CategoryItems AS ci ON ci.ItemResourceId = p.ResourceId
   LEFT JOIN inp_Categories AS c ON c.CategoryId = ci.CategoryId
   WHERE o.Status IN (4,6) AND o.OrderDate >= 1614718800 AND o.OrderDate <= 1614805199
   GROUP BY c.CategoryId
   HAVING NOT ISNULL(CategoryId)
   ORDER BY Metric DESC

There is "SUM() as Metric" column, where SUM argument is missing.

Test plan is all right. But, beyond this patch, exists SQL error when doing "View Chart" for "By Product" and "By Section" cases. Problematic SQL is like

Previous fix changed logic of the code to allow empty field values, but that wasn't on purpose.

Cant test this - do not have macOS