FIX: a suggested fix for #136 where the "lf t55x7 read" command when called with...

FIX:  a suggested fix for #136 where the "lf t55x7 read" command when called with a password. The call will now try loading the config block,  decode it and see if PWD is set.
If PWD Bit is set,  the call will be allowed to execute.
If PWD Bit is NOT set,  the call will print a message and excute the call but without sending the password.
If config block is not being able to read or decode,   the call with print a warning message and exit the call.