fix template error on blocks list when the list isn't full

views/includes/blocks-list.pug

@@ -9,11 +9,12 @@ table(class="table table-striped")
 			th Size (bytes)
 	tbody
 		each block, blockIndex in blocks
-			tr
-				th #{blockIndex + blockOffset + 1}
-				td
-					a(href=("/block-height/" + block.height)) #{block.height}
-				td #{moment.utc(new Date(parseInt(block.time) * 1000)).format("Y-MM-DD HH:mm:ss")}
-				td #{moment.utc(new Date(parseInt(block.time) * 1000)).fromNow(true)}
-				td #{block.tx.length.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",")}
-				td #{block.size.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",")}
+			if (block)
+				tr
+					th #{blockIndex + blockOffset + 1}
+					td
+						a(href=("/block-height/" + block.height)) #{block.height}
+					td #{moment.utc(new Date(parseInt(block.time) * 1000)).format("Y-MM-DD HH:mm:ss")}
+					td #{moment.utc(new Date(parseInt(block.time) * 1000)).fromNow(true)}
+					td #{block.tx.length.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",")}
+					td #{block.size.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",")}