Remove unnecessary element checks

app/assets/javascripts/pipelines/pipeline_details_bundle.js

@@ -16,11 +16,9 @@ export default () => {
 
   mediator.fetchPipeline();
 
-  const pipelineGraphEl = document.querySelector('#js-pipeline-graph-vue');
-  if (pipelineGraphEl) {
   // eslint-disable-next-line
   new Vue({
-      el: pipelineGraphEl,
+    el: '#js-pipeline-graph-vue',
     components: {
       pipelineGraph,
     },
@@ -38,13 +36,10 @@ export default () => {
       });
     },
   });
-  }
 
-  const pipelineHeaderEl = document.querySelector('#js-pipeline-header-vue');
-  if (pipelineHeaderEl) {
   // eslint-disable-next-line
   new Vue({
-      el: pipelineHeaderEl,
+    el: '#js-pipeline-header-vue',
     components: {
       pipelineHeader,
     },
@@ -75,5 +70,4 @@ export default () => {
       });
     },
   });
-  }
 };