Data parsing errors should only show up in upload modal when uploading data #84
Description
When working on #78 on latest branch that shows data parsing errors in upload modal, I noticed the errors associated with the slider parsing show up in the upload modal. The upload modal is not open when you attempt to recreate the bug, but if you open the upload modal after recreating the bug, you will see the error.
So we need to only display errors when user first uploads data in this modal. Subsequent errors due to bugs like this should show up in console.