fix(BlockStream): fix bug where the last block in a stream was not re…

…quested, so stream never ended

lib/blockStream.js

@@ -54,11 +54,11 @@ BlockStream.prototype._next = function () {
     var hash = u.toHash(block.header.hash)
     if (self.requestHeight == null) self.requestHeight = block.height + 1
     self.requestQueue.push(hash)
+    self._getData(block)
     if (!block.next) {
       return self.requestQueue.push(null)
     }
     self.requestCursor = u.toHash(block.next)
-    self._getData(block)
     if (self.pause || self.requestQueue.length >= self.bufferSize) return
     self._next()
   })
@@ -165,5 +165,5 @@ BlockStream.prototype._push = function (i, data) {
     var more = this.push(head)
     if (!more) this.pause = true
   }
-  if (this.buffer[0] === null) this.push(null)
+  if (this.requestQueue[0] === null) this.push(null)
 }