title: How to check if a tinyDB tag has any attributes in App Inventor
body: <p>I need a little help with an issue in App Inventor 2. The case is that I have a JSON result that is parsed, and then have it stored in a tinyDB tag as a list (storeparseData). </p>
  
  <p>Problem is that, I have this function done as screen initiates, so to have the tinyDB tag populated with that JSON list and then searched for a specific value on user request.</p>
  
  <p>As the app is running and I input a search criteria, I get the following error "<strong>The arguments [<em>empty-string</em>] are the wrong number of arguments for GetValue"</strong>. I suppose that, it finds nothing yet to be stored in the tinyDB tag to search for, cause the JSON data take some time to be fetched and parsed.</p>
  
  <p>Here is what I have done for now for checking if the stored list is in the tinyDB:</p>
  
  <p><a href="https://i.stack.imgur.com/Hwluh.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Hwluh.png" alt="enter image description here"></a></p>
  
  <p>Here I check the stored list in tinyDB for an item:</p>
  
  <p><a href="https://i.stack.imgur.com/5VOuj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5VOuj.png" alt="enter image description here"></a></p>
  
  <p>So how can I check if the tinyDB is populated in this tag with the JSON results list, so I can then have it searched?  Is this possible in App Inventor 2?</p>
  
  <p>Please someone advise on this issue with a sample code blocks if possible, or a similar tutorial, if there is any. Thank you all in advance for your answers.</p>