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The CL 0 does round up to 1, but then it gets divided in half for calculating save DC, and it's that fraction that gets rounded down to zero (because fractions always round down in Pathfinder unless otherwise stated).
If the DC bonus had a minimum of 1, then a character would have the same save DC on his sphere effects at CL 3 that he had at CL 0/1. I think we can agree that would be pretty strange.
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