Fixing bug where container would create even if downloading container was deleted

src/utils/DockerUtil.js

@@ -54,6 +54,10 @@ export default {
         stream.setEncoding('utf8');
         stream.on('data', function () {});
         stream.on('end', () => {
+          if (!this.placeholders[container.Name]) {
+            return;
+          }
+
           delete this.placeholders[container.Name];
           localStorage.setItem('placeholders', JSON.stringify(this.placeholders));
           this.createContainer(container.Name, {Image: container.Config.Image});