DS-3127: Process review feedback and fix tests

dspace-api/src/main/java/org/dspace/content/BitstreamServiceImpl.java

@@ -260,15 +260,15 @@ public class BitstreamServiceImpl extends DSpaceObjectServiceImpl<Bitstream> imp
             bundle.getBitstreams().remove(bitstream);
         }
 
+        //Remove all bundles from the bitstream object, clearing the connection in 2 ways
+        bundles.clear();
+
         // Remove bitstream itself
         bitstream.setDeleted(true);
         update(context, bitstream);
 
         // Remove policies only after the bitstream has been updated (otherwise the current user has not WRITE rights)
         authorizeService.removeAllPolicies(context, bitstream);
-
-        //Remove all bundles from the bitstream object, clearing the connection in 2 ways
-        bundles.clear();
     }
 
     @Override