YammerImport: fix for importing over existing user/group nicknames; copies the new data if available onto the existing entry
YammerImport: fix for importing over existing user/group nicknames; copies the new data if available onto the existing entry

xebia/statusnet-oauth2,furtherfield/gnu-social,znarf/statusnet-ladistribution,UngPirat/freesocial,chimo/social,UngPirat/freesocial,Piratas/tortuga,Piratas/tortuga,foocorp/gnu-social,csarven/statusnet,d3vgru/StatusNet,znarf/statusnet-ladistribution,xebia/statusnet-oauth2,zh/statusnet,zcopley/zcopleys-statusnet-clone,studio666/gnu-social,studio666/gnu-social,sikevux/bsk-social,charnimda/lgbtpzn-social,eXcomm/gnu-social,bankonme/gnu-social,csarven/statusnet,eXcomm/gnu-social,d3vgru/StatusNet,faulteh/gnu-social,Piratas/tortuga,shashi/StatusNet,charlycoste/StatusNet,Piratas/tortuga,eXcomm/gnu-social,furtherfield/gnu-social,furtherfield/gnu-social,furtherfield/gnu-social,bankonme/gnu-social,brion/StatusNet,sikevux/bsk-social,studio666/gnu-social,minmb/statusnet,foocorp/gnu-social,zcopley/StatusNet,zcopley/zcopleys-statusnet-clone,sikevux/bsk-social,zcopley/zcopleys-statusnet-clone,sikevux/bsk-social,charnimda/lgbtpzn-social,gnusocial/mainline,csarven/statusnet,zcopley/StatusNet,shashi/StatusNet,d3vgru/StatusNet,znarf/statusnet-ladistribution,foocorp/gnu-social,gnusocial/mainline,gnusocial/mainline,studio666/gnu-social,minmb/statusnet,chimo/social,brion/StatusNet,xebia/statusnet-oauth2,chimo/social,eXcomm/gnu-social,charlycoste/StatusNet,charlycoste/StatusNet,csarven/statusnet,UngPirat/freesocial,faulteh/gnu-social,gnusocial/mainline,faulteh/gnu-social,minmb/statusnet,bankonme/gnu-social,bankonme/gnu-social,brion/StatusNet,zh/statusnet,zh/statusnet,charnimda/lgbtpzn-social,zcopley/StatusNet,faulteh/gnu-social,shashi/StatusNet