Checkmk Werk 14836: HW/SW Inventory: Add cluster property if the tree is not empty

ID: 14836 Title: HW/SW Inventory: Add cluster property if the tree is not empty Component: HW/SW Inventory Level: 1 Class: Bug fix Version: 2.2.0i1 Previously the cluster property was added in any case even if the newly computed tree was empty (ie. no data or inventory plugins did not add any entries). This led to a rather confusing result message of the {{HW/SW Inventory}} service: {{Cannot update tree, Found 1 inventory entries, Got no data, ...}}. Moreover there was no possibility for removing the {{HW/SW Inventory}} tree at all, ie. the icon {{Show hardware/software inventory of this host}} in the dropdown menu of the {{HW/SW Inventory}} stays all the time. Now the mechanism works as follows: LI: Apply all related inventory plugins LI: Apply configured retention intervals LI: If the tree is not empty then set the cluster property and store the tree. LI: Otherwise remove the icon which means: no current inventory tree Note: The retention intervals worked incidentally before because the tree never was empty. Thus they were always applied.