[fix issue#1332]Double check for trial does not have final result

src/webui/src/components/trial-detail/Para.tsx

@@ -78,7 +78,7 @@ class Para extends React.Component<ParaProps, ParaState> {
     getParallelAxis =
         (
             dimName: Array<string>, parallelAxis: Array<Dimobj>,
-            accPara: Array<number>, eachTrialParams: Array<string>, 
+            accPara: Array<number>, eachTrialParams: Array<string>,
             lengthofTrials: number
         ) => {
             // get data for every lines. if dim is choice type, number -> toString()
@@ -276,7 +276,10 @@ class Para extends React.Component<ParaProps, ParaState> {
                 }
             });
             if (this._isMounted) {
-                this.setState({ max: Math.max(...accPara), min: Math.min(...accPara) }, () => {
+                // if not return final result
+                const maxVal = accPara.length === 0 ? 1 : Math.max(...accPara);
+                const minVal = accPara.length === 0 ? 1 : Math.min(...accPara);
+                this.setState({ max: maxVal, min: minVal }, () => {
                     this.getParallelAxis(dimName, parallelAxis, accPara, eachTrialParams, lenOfDataSource);
                 });
             }