ImageryCache crash after cleanStorage

[kcwu]

After cleanStorage, imagerycache throw exception because db is not properly cleaned up.

In cleanStorage(), please add following lines:
dbs.remove(name);
storages.remove(name);

BTW, cleanStorage() dones't handle the case that multiple instance of josm.

[akks]

Thank you for feedback and help!
I tried to fix the issue by adding your lines and making more correct cleaning (delete all files - ., .p and .lock).
It seems to work for me now, please check the updated version: [o29944] [o29946]