fix: 修复error组件在npm模块下异位的问题

src/assets/css/components/components/common/chart-error.scss

@@ -3,7 +3,7 @@
   //width: 100%;
   //height: 100%;
   left: 0;
-  //top: 0;
+  top: 0;
 }
 .error-block {
   display: inline-block;

src/views/charts2/charts/npm/NpmTrafficLine.vue

@@ -19,7 +19,9 @@
       </div>
     </div>
     <div class="npm-traffic-line-body">
-      <chart-error v-if="showError" :content="errorMsg" />
+      <div style="position: absolute;">
+        <chart-error v-if="showError" :content="errorMsg" />
+      </div>
       <chart-no-data v-if="isNoData && !showError"></chart-no-data>
       <div v-show="!isNoData && !showError" class="chart-drawing" id="chart-line"></div>
     </div>