allow values to be zero

Author: kevinsung

src/components/Goban.js

@@ -420,7 +420,7 @@ export default class Goban extends Component {
         for (const v in board.childrenInfo) {
           const [x, y] = v.split(',').map(x => +x)
           const {visits, winrate, scoreLead} = board.childrenInfo[v]
-          if (visits && winrate) {
+          if (isFinite(visits) && isFinite(winrate)) {
             variations.push({vertex: [x, y], visits, winrate, scoreLead})
           }
         }

src/modules/gametree.js

@@ -358,12 +358,18 @@ export function getBoard(tree, id) {
         type = 'good'
       }
 
-      const visits = node.data.VISITS || null
-      const winrate =
-        (node.data.WINRATE && (0.5 + sign * (node.data.WINRATE - 0.5)) * 100) ||
-        null
-      const scoreLead =
-        (node.data.SCORELEAD && node.data.SCORELEAD * sign) || null
+      let visits = null
+      let winrate = null
+      let scoreLead = null
+      if (isFinite(node.data.VISITS)) {
+        visits = +node.data.VISITS
+      }
+      if (isFinite(node.data.WINRATE)) {
+        winrate = (0.5 + sign * (node.data.WINRATE - 0.5)) * 100
+      }
+      if (isFinite(node.data.SCORELEAD)) {
+        scoreLead = node.data.SCORELEAD * sign
+      }
 
       list[v] = {sign, type, visits, winrate, scoreLead}
     }