fix bug of trial detail page break down when succeed trial have not final result (#1015)

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

@@ -30,7 +30,8 @@ class DefaultPoint extends React.Component<DefaultPointProps, DefaultPointState>
         const accSource: Array<DetailAccurPoint> = [];
         Object.keys(showSource).map(item => {
             const temp = showSource[item];
-            if (temp.status === 'SUCCEEDED' && temp.acc.default !== undefined) {
+            if (temp.status === 'SUCCEEDED' && temp.acc !== undefined) {
+                if (temp.acc.default !== undefined) {
                     const searchSpace = temp.description.parameters;
                     accSource.push({
                         acc: temp.acc.default,
@@ -38,6 +39,7 @@ class DefaultPoint extends React.Component<DefaultPointProps, DefaultPointState>
                         searchSpace: JSON.stringify(searchSpace)
                     });
                 }
+            }
         });
         const resultList: Array<number | string>[] = [];
         Object.keys(accSource).map(item => {