return 0 for getDelegateRewards if didn't vote in the screening stage

Makefile

@@ -17,6 +17,7 @@ build  :; forge clean && forge build --optimize --optimizer-runs 1000000
 # Tests
 tests                                :; forge clean && forge test --mt test --optimize --optimizer-runs 1000000 -v # --ffi # enable if you need the `ffi` cheat code on HEVM
 test-with-gas-report                 :; forge clean && forge build && forge test --mt test --optimize --optimizer-runs 1000000 -v --gas-report # --ffi # enable if you need the `ffi` cheat code on HEVM
+test-unit							 :; forge clean && forge test --no-match-test invariant --optimize --optimizer-runs 1000000 -v # --ffi # enable if you need the `ffi` cheat code on HEVM
 test-invariant                       :; ./test/invariants/test-invariant.sh ${SCENARIO} ${NUM_ACTORS} ${NUM_PROPOSALS} ${PER_ADDRESS_TOKEN_REQ_CAP}
 test-invariant-all                   :; forge clean && forge t --mt invariant
 test-invariant-multiple-distribution :; forge clean && ./test/invariants/test-invariant.sh MultipleDistribution 2 25 200

src/grants/GrantFund.sol

@@ -1099,6 +1099,8 @@ contract GrantFund is IGrantFund, Storage, ReentrancyGuard {
         DistributionPeriod storage currentDistribution = _distributions[distributionId_];
         VoterInfo          storage voter               = _voterInfo[distributionId_][voter_];
 
+        if (voter.screeningVotesCast == 0) return 0;
+
         rewards_ = _getDelegateReward(currentDistribution, voter);
     }
 

test/unit/StandardFunding.t.sol

@@ -1273,6 +1273,10 @@ contract StandardFundingGrantFundTest is GrantFundTestHelper {
         /******************************/
 
         // Claim delegate reward for all delegatees
+        // delegates who didn't vote in the screening stage have zero rewards
+        delegateRewards = _grantFund.getDelegateReward(distributionId, _tokenHolder11);
+        assertEq(delegateRewards, 0);
+
         // delegates who didn't vote with their full power receive fewer rewards
         delegateRewards = _grantFund.getDelegateReward(distributionId, _tokenHolder1);
         assertEq(delegateRewards, 327_029.344384908148174595 * 1e18);