Small cleanup

programs/validator-history/idl/validator_history.json

@@ -903,7 +903,7 @@
     {
       "code": 6001,
       "name": "InvalidEpochCredits",
-      "msg": "Invalid epoch credits, credits must be greater than previous credits"
+      "msg": "Invalid epoch credits, credits must exist and each value must be greater than previous credits"
     },
     {
       "code": 6002,
@@ -928,7 +928,7 @@
     {
       "code": 6006,
       "name": "NotEnoughVotingHistory",
-      "msg": "Not enough voting history to create account. Minimum 10 epochs required"
+      "msg": "Not enough voting history to create account. Minimum 5 epochs required"
     },
     {
       "code": 6007,

programs/validator-history/src/errors.rs

@@ -5,7 +5,7 @@ pub enum ValidatorHistoryError {
     #[msg("Account already reached proper size, no more allocations allowed")]
     AccountFullySized,
     #[msg(
-        "Invalid epoch credits, credits exist and each value must be greater than previous credits"
+        "Invalid epoch credits, credits must exist and each value must be greater than previous credits"
     )]
     InvalidEpochCredits,
     #[msg("Epoch is out of range of history")]

programs/validator-history/src/state.rs

@@ -442,12 +442,13 @@ impl ValidatorHistory {
             }));
 
         for (entry_is_some, epoch) in entries.iter().zip(start_epoch as u16..=end_epoch) {
-            if !*entry_is_some && epoch_credits_map.get(&epoch).is_some() {
+            if !*entry_is_some && epoch_credits_map.contains_key(&epoch) {
+                // Inserts blank entry that will have credits copied to it later
                 let entry = ValidatorHistoryEntry {
                     epoch,
                     ..ValidatorHistoryEntry::default()
                 };
-                // If entry cannot be inserted, skips
+                // Skips if epoch is out of range or duplicate
                 self.history.insert(entry, epoch).unwrap_or_default();
             }
         }