Hide media upload form if no media are attached

app/javascript/flavours/glitch/features/compose/components/upload_form.js

@@ -16,11 +16,13 @@ export default class UploadForm extends ImmutablePureComponent {
       <div className='composer--upload_form'>
         <UploadProgressContainer />
 
+        {mediaIds.size > 0 && (
           <div className='content'>
             {mediaIds.map(id => (
               <UploadContainer id={id} key={id} />
             ))}
           </div>
+        )}
       </div>
     );
   }

app/javascript/flavours/glitch/styles/components/composer.scss

@@ -241,16 +241,14 @@
 }
 
 .composer--upload_form {
-  padding: 5px;
-  color: $inverted-text-color;
-  background: $simple-background-color;
-  font-size: 14px;
+  overflow: hidden;
 
   & > .content {
     display: flex;
     flex-direction: row;
     flex-wrap: wrap;
     font-family: inherit;
+    padding: 5px;
     overflow: hidden;
   }
 }