arduino: MIME update for empty files
arduino: MIME update for empty files

arduino-org/OS.js-v2,arduino-org/OS.js-v2,arduino-org/Arduino-OS,arduino-org/Arduino-OS,arduino-org/OS.js-v2,arduino-org/OS.js-v2,arduino-org/OS.js-v2,arduino-org/Arduino-OS,arduino-org/Arduino-OS,arduino-org/Arduino-OS