Fix for monaco toolbox Edge/IE issue (null showing in toolbox)
Fix for monaco toolbox Edge/IE issue (null showing in toolbox)

switchinnovations/pxt,Microsoft/pxt,switch-education/pxt,Microsoft/pxt,playi/pxt,Microsoft/pxt,Microsoft/pxt,playi/pxt,switchinnovations/pxt,switch-education/pxt,switchinnovations/pxt,Microsoft/pxt,playi/pxt,switch-education/pxt,playi/pxt,switch-education/pxt,switch-education/pxt,switchinnovations/pxt