Steps to reproduce:

1. Navigate to any host --> Graphs.
2. Click create graph
3. Only add items from another hosts. 
4. Click Add

Result:
See message "Graph added", but there are no this graph in the list. Though the graph is added to the database. The new graph is shown in the list only if it has at least one item from the selected host.
Expected:
Graph is actually added and can be seen in the Graphs section.