DataSetMessage Header Parsing -Understanding the meaning from Spec|OPC UA Standard|Forum|OPC Foundation

The OPC UA PubSub spec., version 1.04, Part 14 on page 70, Table 81 – DataSetMessage Header Structure says that:

The DataSetFlags2 shall be omitted if bit 7 of the DataSetFlags1 is false. If the field is omitted, the Subscriber shall handle the related bits as false!

I have now 2 questions interpreting this statement:

1. Does it mean that if the bit 7 of the DataSetFlags1 is false, then I don’t have the DataSetFlags2 as a byte in the message at all?

2. What does it mean “Subscriber shall handle the related bits as false” – Does it mean that I still read the Byte as DataSetFlags2, but assume that every flag in the Byte is false?