Fix problem with pcon shape when rmin==rmax on top or bottom
Fix problem with pcon shape when rmin==rmax on top or bottom

Signed-off-by: Sergey Linev <e975f594b5fd242373e09af42cc211e3844763a6@gsi.de>

linev/jsroot,root-project/jsroot,bellenot/jsroot,root-project/jsroot,bellenot/jsroot,bellenot/jsroot,linev/jsroot