Hmm....
No Nazis is usually taken to mean the Spartacists would've been proportionately stronger in Weimar Germany. Perhaps even leading to Germany "going Red" and allied with the Soviet Union.
It would be no small feat for the political mess that was 1920s Germany to avoid that without going autocratic in order to fend off the Soviet influence.
Assuming that the Weimar Republic did, somehow, manage to navigate through the horrendous mess Germany's loss created and simultaneously avoided falling to the Nazis AND falling to the Spartacists would mean the resulting state would be far less radicalized and far less easily manipulated into an aggressive foreign policy in the 1930s.
That, in turn, would make a WWII much more unlikely. At least one which was otherwise recognizable as what happened in OTL.
Without the Nazi's rearmament policies, Germany would not be as militarily strong by the late 30s. On the flip side, without the fiscal insanity of the NSDAP, Germany's economy would be far more robust and stable. Thus it wouldn't need to conquer its neighbors to plunder their wealth just to keep things going back home.
The further along you get from the Great War without some new tyrant or tyrannical movement coming to power in Germany, the less likely the German people would be to support such a thing. Particularly if there's overall economic improvement for all Germans.
Again, this'd be no small feat.