title: Spring's PropertyPlaceHolderConfigurer won't ignore unresolvable files
body: <p>I am using spring's PropertyPlaceHolderConfigurer as follows :</p>
  
  <pre><code>&lt;bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"&gt;
      &lt;property name="ignoreUnresolvablePlaceholders" value="true" /&gt;
      &lt;property name="locations"&gt;
          &lt;list&gt;
              &lt;value&gt;classpath:default.properties&lt;/value&gt;
              &lt;value&gt;file:${user.home}/webextractor.properties&lt;/value&gt;
          &lt;/list&gt;
      &lt;/property&gt;
  &lt;/bean&gt;
  </code></pre>
  
  <p>Despite having set the <code>ignoreUnresolvablePlaceholders</code> property to <code>true</code>, I still get a <code>FileNotFoundException</code> on <code>/home/kaykay/webextractor.properties</code>. I know I could just create this file and leave it empty, but I'd like to know what is wrong here.</p>