title: Checking for empty queryset in Django
body: <p>What is the recommended idiom for checking whether a query returned any results?<br>
  Example:</p>
  
  <pre><code>orgs = Organisation.objects.filter(name__iexact = 'Fjuk inc')
  # If any results
      # Do this with the results without querying again.
  # Else, do something else...
  </code></pre>
  
  <p>I suppose there are several different ways of checking this, but I'd like to know how an experienced Django user would do it.
  Most examples in the docs just ignore the case where nothing was found...</p>