Prevent crash on unsupported VFS
Prevent crash on unsupported VFS

Rxswyers/OS.js,dmikey/OS.js-v2,twkrol/OS.js-v2,ellis/OS.js-v2,arduino-org/Arduino-OS,omet-ca/omet-desktop,Rxswyers/OS.js,twkrol/OS.js-v2,marcinlimanski/OS.js-v2,marcinlimanski/OS.js-v2,Rxswyers/OS.js,omet-ca/omet-desktop,ellis/OS.js-v2,dmikey/OS.js-v2,dmikey/OS.js-v2,dmikey/OS.js-v2,gravityacademy/OS.js-v2,salman-kamkoriwala/OsJsSample,gravityacademy/OS.js-v2,marcinlimanski/OS.js-v2,arduino-org/OS.js-v2,andersevenrud/OS.js-v2,arduino-org/OS.js-v2,andersevenrud/OS.js-v2,arduino-org/Arduino-OS,ellis/OS.js-v2,arduino-org/Arduino-OS,ellis/OS.js-v2,twkrol/OS.js-v2,arduino-org/Arduino-OS,twkrol/OS.js-v2,dmikey/OS.js-v2,twkrol/OS.js-v2,marcinlimanski/OS.js-v2,omet-ca/omet-desktop,gravityacademy/OS.js-v2,andersevenrud/OS.js-v2,salman-kamkoriwala/OsJsSample,salman-kamkoriwala/OsJsSample,andersevenrud/OS.js-v2,marcinlimanski/OS.js-v2,salman-kamkoriwala/OsJsSample,Rxswyers/OS.js,omet-ca/omet-desktop,arduino-org/Arduino-OS,salman-kamkoriwala/OsJsSample,ellis/OS.js-v2,arduino-org/OS.js-v2,arduino-org/OS.js-v2,arduino-org/OS.js-v2,Rxswyers/OS.js,gravityacademy/OS.js-v2,omet-ca/omet-desktop,andersevenrud/OS.js-v2,gravityacademy/OS.js-v2