title: How to use underscore.js to find if a String is blank?
body: <p>I am looking an equivalent of <a href="http://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/StringUtils.html#isBlank(java.lang.CharSequence)">http://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/StringUtils.html#isBlank(java.lang.CharSequence)</a>
  I found several 3rd party extensions, but is there one out of the box with underscore.js: <a href="http://underscorejs.org">http://underscorejs.org</a></p>