Fix a divide-by-zero in the StatVigor test

src/game/combat/tests.ts

@@ -30,8 +30,8 @@ export class StatVigorTest extends RandomTest {
     let targetPercent = 1
 
     Object.keys(Vigor).forEach(key => {
-      userPercent *= user.vigors[key as Vigor] / user.maxVigors[key as Vigor]
-      targetPercent *= target.vigors[key as Vigor] / target.maxVigors[key as Vigor]
+      userPercent *= user.vigors[key as Vigor] / Math.max(1, user.maxVigors[key as Vigor])
+      targetPercent *= target.vigors[key as Vigor] / Math.max(1, target.maxVigors[key as Vigor])
 
       userPercent = Math.max(0, userPercent)
       targetPercent = Math.max(0, targetPercent)