RSM

....I..... [RSM-1] 519: don't fail if no .enabled items for service; better errors in get_itemid_by_host()

* commit 'ca916cabe63f41da327f0523f085008e078506e4':
  ....I..... [RSM-1] 519: corrected per review comments
  ....I..... [RSM-1] 519: don't fail if no .enabled items for service; better errors in get_itemid_by_host()
  ....I..... [RSM-1] 521: made warning message more clear