Fixed bug in which the FTP tree could try to destroy an unexisting instance of FTP
Fixed bug in which the FTP tree could try to destroy an unexisting instance of FTP

mnutt/jsDAV,tritech/jsDAV,jsilvestre/jsDAV,cozy/jsDAV,cozy/jsDAV,Mailden/jsDAV-original,mikedeboer/jsDAV,9590/jsDAV,Mailden/jsDAV-original,jsilvestre/jsDAV,9590/jsDAV,clochix/jsDAV,WigWagCo/jsDAV,WigWagCo/jsDAV,mikedeboer/jsDAV,protonet/jsDAV,arcana261/jsDAV,protonet/jsDAV,clochix/jsDAV,mnutt/jsDAV,arcana261/jsDAV,tritech/jsDAV