[完善]完善对比数据bug

src/app/plan-audit/wait-examineer/wait-examineer.component.html

@@ -109,7 +109,7 @@
       <div *ngIf="showtype == 3" id="firefacilities" style="margin: 10px;">
         <mat-accordion *ngIf="selectedItem.differentContent" class="tableContent" multi>
           <!-- 基本信息 -->
-          <mat-expansion-panel  *ngIf="this.differentContentOfUnitInfo[0].childrens.length != 0" expanded>
+          <mat-expansion-panel  *ngIf="this.differentContentOfUnitInfo.length != 0 && this.differentContentOfUnitInfo[0].childrens.length != 0" expanded>
             <mat-expansion-panel-header collapsedHeight='40px' expandedHeight='40px' class="panelhead"
               style="background-color: #2196F3;">
               <mat-panel-title style="font-size: 16px;color: #FFFFFF;">
@@ -219,7 +219,7 @@
             </div>
           </mat-expansion-panel>
           <!-- 实景图 -->
-          <mat-expansion-panel  *ngIf="this.differentContentOfPicture[0].childrens.length != 0" expanded>
+          <mat-expansion-panel  *ngIf="this.differentContentOfPicture.length != 0 && this.differentContentOfPicture[0].childrens.length != 0" expanded>
             <mat-expansion-panel-header collapsedHeight='40px' expandedHeight='40px' class="panelhead"
               style="background-color: #2196F3;">
               <mat-panel-title style="font-size: 16px;color: #FFFFFF;">