[ENH] correct some typos in the code comments lines and add a check to not bother doing the graph if all the y-values are zero
[ENH] correct some typos in the code comments lines and add a check to not bother doing the graph if all the y-values are zero

git-svn-id: a7fabbc6a7c54ea5c67cbd16bd322330fd10cc35@53160 b456876b-0849-0410-b77d-98878d47e9d5

changi67/tiki,tikiorg/tiki,oregional/tiki,tikiorg/tiki,tikiorg/tiki,changi67/tiki,oregional/tiki,changi67/tiki,oregional/tiki,tikiorg/tiki,changi67/tiki,changi67/tiki,oregional/tiki