Return stakes if n participant #47

Is your feature request related to a problem? Please describe.
Currently, the 1st participant is not incentivised to participate because there are no pool rewards and he might end up losing money to DAO if he is wrong

Describe the solution you'd like
Return participation amount in case there is only 1 participant, irrespective of whether he is right or wrong.
Dispute should not be allowed if participation = 1