Fix the vue/v-on-handler-style breaking change (vuejs#2538)

Author: heggria

lib/rules/v-on-handler-style.js

@@ -314,6 +314,10 @@ module.exports = {
             return null
           }
           const paramCount = methodParamCountMap.get(idCallExpr.callee.name)
+          // disable the auto-fixed when the node does't have params
+          if (paramCount == 0) {
+            return null
+          }
           if (paramCount != null && paramCount > 0) {
             // The behavior of target method can change given the arguments.
             return null
@@ -368,7 +372,8 @@ module.exports = {
           ) {
             return null
           }
-          if (!isSameParamsAndArgs(idCallExpr)) {
+          // disable the auto-fixed when the node does't have params
+          if (node.params.length === 0 || !isSameParamsAndArgs(idCallExpr)) {
             // It is not a call with the arguments given as is.
             return null
           }