Fix runmigration cached using DB load and create #250
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Allow to set restore a cached DB and create a new one
If both LOAD_DB_CACHE (with a ceil version) and CREATE_DB_CACHE were set,
in case the directory containing cached DB is empty the CACHED_DUMP variable
was emptied and the script was unable to create a new dump.
It also prevent to rename the new cache dump with the previous dump name.