I was looking for a simple way to filter for tasks which have no label. Currently the only way I have found to do so is to create a filter of
"!@label1 & @!label2 & !@label3..."
including each of the labels I have defined. Creating a filter of "no label" seems not to work. Is there a simpler mechanism which would allow me to create this filter and not update it if my labels expand or change over time?