The butter dish is a homely, everyday object, and dream books link it to comfort, softness and ordinary domestic ease. An empty one is read as a small lack felt at home.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.