I have noticed a strange behavior in the JS code of the Query Tool. When a JS error occurs at any point during the execution of a query, the code is traced back to the last ajax call and goes to the catch portion (as if the ajax call failed). This leads to a "Not connected to the server" error message to the user, which is wrong.
I noticed this behavior before when fixing the bug where "Not connected to the server" message appeared when the user queries a column with no columns, which was due to a JS error being mistakenly identified as an ajax error.
Does anybody have any idea why this happens? This doesn't seem right.