Iterator should return without errors if no more blocks

index.js

@@ -937,6 +937,10 @@ Blockchain.prototype._iterator = function (name, func, cb) {
         blockNumber.iaddn(1)
       } else {
         blockNumber = false
+        // No more blocks, return
+        if (err instanceof levelup.errors.NotFoundError) {
+          return cb2()
+        }
       }
       cb2(err)
     })

test/index.js

@@ -13,7 +13,7 @@ const BN = require('bn.js')
 const rlp = ethUtil.rlp
 
 test('blockchain test', function (t) {
-  t.plan(72)
+  t.plan(73)
   var blockchain = new Blockchain()
   var genesisBlock
   var blocks = []
@@ -253,7 +253,8 @@ test('blockchain test', function (t) {
       blockchain.iterator('test', function () {
         t.ok(false, 'should not call iterator function')
         done()
-      }, function () {
+      }, function (err) {
+        t.error(err, 'should not return error')
         t.ok(true, 'should finish iterating')
         done()
       })