removed unnecessary for loop on source data update (#5707)
removed unnecessary for loop on source data update (#5707)

* removed unnecessary for loop on source data update

* tabs -> spaces

* remove bad indent

aiguofer/bokeh,rs2/bokeh,timsnyder/bokeh,aiguofer/bokeh,philippjfr/bokeh,percyfal/bokeh,ericmjl/bokeh,dennisobrien/bokeh,dennisobrien/bokeh,ericmjl/bokeh,aavanian/bokeh,aavanian/bokeh,Karel-van-de-Plassche/bokeh,schoolie/bokeh,bokeh/bokeh,Karel-van-de-Plassche/bokeh,stonebig/bokeh,timsnyder/bokeh,schoolie/bokeh,jakirkham/bokeh,dennisobrien/bokeh,rs2/bokeh,jakirkham/bokeh,bokeh/bokeh,timsnyder/bokeh,schoolie/bokeh,ericmjl/bokeh,stonebig/bokeh,mindriot101/bokeh,jakirkham/bokeh,draperjames/bokeh,timsnyder/bokeh,aavanian/bokeh,percyfal/bokeh,DuCorey/bokeh,ericmjl/bokeh,timsnyder/bokeh,Karel-van-de-Plassche/bokeh,percyfal/bokeh,rs2/bokeh,Karel-van-de-Plassche/bokeh,draperjames/bokeh,stonebig/bokeh,bokeh/bokeh,DuCorey/bokeh,schoolie/bokeh,aiguofer/bokeh,draperjames/bokeh,aiguofer/bokeh,bokeh/bokeh,dennisobrien/bokeh,percyfal/bokeh,mindriot101/bokeh,jakirkham/bokeh,DuCorey/bokeh,draperjames/bokeh,percyfal/bokeh,Karel-van-de-Plassche/bokeh,jakirkham/bokeh,philippjfr/bokeh,aavanian/bokeh,philippjfr/bokeh,aiguofer/bokeh,ericmjl/bokeh,draperjames/bokeh,mindriot101/bokeh,DuCorey/bokeh,rs2/bokeh,rs2/bokeh,bokeh/bokeh,mindriot101/bokeh,schoolie/bokeh,aavanian/bokeh,dennisobrien/bokeh,philippjfr/bokeh,philippjfr/bokeh,DuCorey/bokeh,stonebig/bokeh