idiag: don't dump unset properties of idiag_msg
idiag: don't dump unset properties of idiag_msg

Acked-by: Thomas Graf <17c2d8920621522552b392f72d8fdb4d1e866b44@suug.ch>
Signed-off-by: Thomas Haller <16e26612e4159990a6b3691e92592e691ff74132@redhat.com>

cfriedt/libnl,tklauser/libnl,honsys/libnl,claudelee/libnl,claudelee/libnl,cfriedt/libnl,tgraf/libnl,tklauser/libnl,thom311/libnl,HolyShitMan/libnl-1,thom311/libnl,cfriedt/libnl,kolyshkin/libnl,mshirley/libnl,houstar/libnl,congwang/libnl,congwang/libnl,tgraf/libnl,tklauser/libnl,tgraf/libnl,HolyShitMan/libnl-1,houstar/libnl,dsahern/libnl,greearb/libnl-ct,congwang/libnl,honsys/libnl,mshirley/libnl,claudelee/libnl,baloo/libnl,houstar/libnl,dsahern/libnl,claudelee/libnl,kolyshkin/libnl,houstar/libnl,tgraf/libnl,greearb/libnl-ct,greearb/libnl-ct,kolyshkin/libnl,honsys/libnl,tklauser/libnl,kolyshkin/libnl,dsahern/libnl,HolyShitMan/libnl-1,mshirley/libnl,thom311/libnl,baloo/libnl,baloo/libnl,mshirley/libnl,honsys/libnl,congwang/libnl,cfriedt/libnl,HolyShitMan/libnl-1,dsahern/libnl,baloo/libnl