I found this in the shed of my parents, while taking my son to visit his grandparents. It belonged, originally, to my grandmother. There are two distinct ways to interpret the sentence:

‘Without a cat, a home is just a house’

which was probably the intent of the author, and certainly the intent of my cat-loving grandmother and cat-loving parents. I, however, prefer the alternative, where the phrase ‘without a cat’ attaches to ‘house’ rather than the sentence as a whole. :
or, to make it explicit:

‘A home is just (a house without a cat)’

From the 2004 Presidential Campaign: Victory, which claims that Iraq and Afghanistan were now (in 2004) democracies. It was pulled because of complaints almost immediately.

From the 2004 Presidential Campaign: the 527 ‘Progress for America’: ‘These people want to kill us’ – the list of ‘these people’ includes Chechen rebels.

From the 2004 Presidential Campaign: the 527 ‘Swift Boat Veterans for Truth’ ran this ad questioning Kerry’s public biography about his war record: