Added error handling in metadata callback
Added error handling in metadata callback

deiu/ldnode,evWork/nds-server,timbl/ldnode,nicola/ldnode,dmitrizagidulin/solid-server-unstable,dmitrizagidulin/solid-server-unstable,martinmr/node-ldp-httpd,linkeddata/ldnode,nicola/ldnode,timbl/ldnode,evWork/nds-server,linkeddata/ldnode,deiu/ldnode,evWork/nds-server,dmitrizagidulin/solid-server-unstable,martinmr/node-ldp-httpd