EDIT

Refactor ABCD import

• use association wrapper to store prefix
• correctly push and pop import state
• only delete field unit if it has no other links to objects

Refactor ABCD import

• removed "determination on field unit level" flag
• parse unit associations recursively
• removed field unit from import state
• enhanced unit association handling concerning field units and ereivation events

Fix taxon existance check

Add import report logging to utility methods

Catch exception instead of throwing them

Lets the methods return

Error loggind during import

minor

Add exception during import to report

Fix classification handling for new and exisiting taxa

Exception handling

• moved report printing to finally clause to always have a report.
• fixed possible NPE