XWPF automatically creates a blank paragraph in a new header or footer when no paragraphs are assigned during creation. This makes header/footer creation more complicated than it needs to be because it requires the user to either create an array of unbound paragraphs prior to the header / footer, or the user has to treat the first paragraph in the header / footer differently than all the rest. It is also inconvenient when the first element in a header / footer is something other than a paragraph.
I would like to remove this behavior since if a user of this library is creating a header or footer, they are going to add something to it. This behavior change would be a breaking change though for some people who are creating documents with headers or footers, but the assumption that most headers and footers only contain a single paragraph is incorrect, at least it is for most of my documents, and for many of them, my header contains a table to split things up into left side / center / right side text. What do you think?
