title: Magento Product import error - SQLSTATE[23000]: Integrity constraint violation: 1048 Column ‘attribute_id’ cannot be null
body: <p>I am having an issue uploading a large csv of products.</p>
  
  <p>It goes through the check on then after then import says: SQLSTATE[23000]: Integrity constraint violation: 1048 Column ‘attribute_id’ cannot be null</p>
  
  <p>After this has done I have checked the products page and they are all there but do not seem to be in the categories, do not show in search and even if I manually enable the categories do not show.</p>
  
  <p>Any ideas? Really stuck!</p>