fmbtandroid: show error message on missing /sdcard
fmbtandroid: show error message on missing /sdcard

yoonkiss/fMBT,mixu-/fMBT,01org/fMBT,mixu-/fMBT,mixu-/fMBT,violep01/fMBT,yoonkiss/fMBT,violep01/fMBT,violep01/fMBT,yoonkiss/fMBT,yoonkiss/fMBT,mixu-/fMBT,01org/fMBT,mixu-/fMBT,yoonkiss/fMBT,01org/fMBT,01org/fMBT,violep01/fMBT,violep01/fMBT,01org/fMBT