Hotfix: LDC-387 Fixing errors with Aggregator

## Ready State YES
https://imagex.atlassian.net/browse/LDC-387

Added some preprocess hooks to be able to check individual fields before adding them.
Added feedback to the processing to track the number of inserted, skipped, and errored items.
Added A catch statement to prevent WSOD.
Added some continue into the catch statements so the whole thing doesn't break if one item is bad. That item is now tracked as not imported and the lop continues.