Add function to handle xhr request errors for deleting queries
Add function to handle xhr request errors for deleting queries

msassmann/texcavator,msassmann/texcavator,UUDigitalHumanitieslab/texcavator,UUDigitalHumanitieslab/texcavator,msassmann/texcavator,msassmann/texcavator,UUDigitalHumanitieslab/texcavator