fix(仪表板): 修复移动端布局后仪表板无法继续向tab组件添加图表问题

core/core-frontend/src/custom-component/de-tabs/Component.vue

@@ -264,6 +264,7 @@ const componentMoveIn = component => {
       dvMainStore.setCurComponent({ component: null, index: null })
       component.canvasId = element.value.id + '--' + tabItem.name
       const refInstance = currentInstance.refs['tabCanvas_' + index][0]
+      if (refInstance) {
         const matrixBase = refInstance.getBaseMatrixSize() //矩阵基础大小
         canvasChangeAdaptor(component, matrixBase)
         tabItem.componentData.push(component)
@@ -275,6 +276,7 @@ const componentMoveIn = component => {
           refInstance.addItemBox(component) //在适当的时候初始化布局组件
         })
       }
+    }
   })
 }