Attempt to modify property "col_content" on null (1.14@beta)

Patch for 1.14@beta.

updated
checked

Found one case on same structure for empty config when content is empty. Added to the patch as well. It makes fatal on new link creation from typical menu item form.

All previous patches were hidden as not actual.

I confirm that the error is still in v1.16 and the #7 patch solves the issue.