What is the minimum contribution expected from an M.Sc. thesis?
In my opinion and experience, it is relatively rare for an MSc thesis to yield truly original research resulting in a paper. The primary goal of a MSc thesis is to teach you important research skills: come up with a general idea of what to do, researching literature, coming up with a specific question that you want to address, performing research (computations, fieldwork, lab experiments), and finally writing it down in a thesis. If you successfully complete this cycle, I think your MSc thesis is a success. If the thesis, after some editing, is original enough to end up as a journal paper this is a big bonus.