Fixed: creating a backup from an older eXist version may result in an NPE due to missing creation  and last-modification date fields.
Fixed: creating a backup from an older eXist version may result in an NPE due to missing creation 
and last-modification date fields.

svn path=/trunk/eXist-1.0/; revision=3658

joewiz/exist,zwobit/exist,jensopetersen/exist,ambs/exist,hungerburg/exist,kohsah/exist,olvidalo/exist,hungerburg/exist,lcahlander/exist,kohsah/exist,dizzzz/exist,dizzzz/exist,zwobit/exist,shabanovd/exist,wolfgangmm/exist,hungerburg/exist,wshager/exist,wolfgangmm/exist,adamretter/exist,MjAbuz/exist,wolfgangmm/exist,opax/exist,wshager/exist,hungerburg/exist,wshager/exist,wshager/exist,windauer/exist,ambs/exist,ljo/exist,patczar/exist,MjAbuz/exist,opax/exist,zwobit/exist,windauer/exist,eXist-db/exist,patczar/exist,shabanovd/exist,wshager/exist,kohsah/exist,MjAbuz/exist,dizzzz/exist,zwobit/exist,shabanovd/exist,zwobit/exist,jensopetersen/exist,ambs/exist,patczar/exist,MjAbuz/exist,eXist-db/exist,adamretter/exist,joewiz/exist,olvidalo/exist,lcahlander/exist,patczar/exist,joewiz/exist,eXist-db/exist,jessealama/exist,jessealama/exist,jessealama/exist,RemiKoutcherawy/exist,dizzzz/exist,ambs/exist,jensopetersen/exist,wshager/exist,joewiz/exist,lcahlander/exist,MjAbuz/exist,wolfgangmm/exist,windauer/exist,eXist-db/exist,eXist-db/exist,wolfgangmm/exist,jessealama/exist,eXist-db/exist,olvidalo/exist,windauer/exist,dizzzz/exist,adamretter/exist,ljo/exist,shabanovd/exist,windauer/exist,kohsah/exist,patczar/exist,jessealama/exist,olvidalo/exist,dizzzz/exist,MjAbuz/exist,opax/exist,kohsah/exist,joewiz/exist,joewiz/exist,ljo/exist,kohsah/exist,lcahlander/exist,lcahlander/exist,RemiKoutcherawy/exist,RemiKoutcherawy/exist,hungerburg/exist,RemiKoutcherawy/exist,shabanovd/exist,ljo/exist,shabanovd/exist,adamretter/exist,ambs/exist,zwobit/exist,adamretter/exist,lcahlander/exist,ljo/exist,adamretter/exist,wolfgangmm/exist,opax/exist,jessealama/exist,jensopetersen/exist,RemiKoutcherawy/exist,windauer/exist,ljo/exist,patczar/exist,ambs/exist,olvidalo/exist,RemiKoutcherawy/exist,jensopetersen/exist,opax/exist,jensopetersen/exist