98_Modbus.pm: added small features and fixed a bug (register number 0) - also in ModbusAttr.pm
98_Modbus.pm: added small features and fixed a bug (register number 0) - also in ModbusAttr.pmView Changes
Source: 98_Modbus.pm: added small features and fixed a bug (register number 0) - also in ModbusAttr.pm (http://sourceforge.net/p/fhem/code/9129/)