don't crash on broken links
don't crash on broken links

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