lost connection to Modbus API leads to noneType Error #8
Description
In case the Modbus connection is interrupted, the _read_registers function in MTECmodbusAPI.py tries to reconnect.
If this works the connection is established again, but the register is not read and the return is empty (NoneType).
This could be improved by calling self.modbus_client.read_holding_registers to read the data out of the reconnected Modbus.