Reading the attribute-content of an html-element with extjs

A current project consists of an ASP.Net MVC application which “renders” its current version as an html-meta tag.

<meta name="x-app-version" content="1.1.427.1616" />

A requirement was to show this version (which is rendered server-side) on the login screen (which is a viewport containing panels and such).

The following code does a selection (via css-selector) of the concrete element and reads its attribute “content” and uses it as a value for a displayfield.

// ... further controller code
me.down('theDisplayField').setValue(
  Ext.dom.Element
    .select("meta[name='x-app-version']")
    .first()
    .getAttribute('content')
  );

I presume that the meta-tag exists therefore no check of the return-value of the select-method is done.