Handle redirect on error when saving permissions or related items #1296
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This provides a bugfix.
When you save a new object with permissions or related items in the form, BEM processes data save in different steps (it's not a transaction): first it saves the object, then permissions, then related items.
Buggy behaviour: if there is an exception in "saving permissions" or "saving related items", new object is saved but the page is still "new object page".
Fixed behaviour: if there is an exception in "saving permissions" or "saving related items", new object is saved, there's a redirect to the new object page with proper flash error(s).