Handle empty times field in JS line item total calculation.
Handle empty times field in JS line item total calculation.

hauledev/bookyt,silvermind/bookyt,xuewenfei/bookyt,huerlisi/bookyt,gaapt/bookyt,gaapt/bookyt,hauledev/bookyt,gaapt/bookyt,huerlisi/bookyt,silvermind/bookyt,silvermind/bookyt,silvermind/bookyt,huerlisi/bookyt,gaapt/bookyt,hauledev/bookyt,hauledev/bookyt,xuewenfei/bookyt,wtag/bookyt,wtag/bookyt,xuewenfei/bookyt,wtag/bookyt