A better question is if you have nothing to write about, why do you have a blog?
That is not meant to sound mean, it is one of the questions that I encourage people to ask, because the answer will give you something to write about.
I also recommend making a list. as you think of something add it to the list, then on a day when there is nothing to write about, just pick off the list you have.
The other thing I do is to take a lot of pictures every day. inevitably, they become the blog posts of the future, either as a visual of what I was doing that day, or as an example of something that I may be writing about.
stay encouraged, writers block is inevitable, but it doesnt last long.
