Fixed nil pointer ref for comparison

Author: Manuelvaas

internal/cmd/network-interface/list/list.go

@@ -187,7 +187,7 @@ func outputProjectResult(p *print.Printer, outputFormat string, nics []iaas.NIC,
 		}
 
 		slices.SortFunc(nics, func(a, b iaas.NIC) int {
-			return cmp.Compare(*a.NetworkId, *b.NetworkId)
+			return cmp.Compare(utils.PtrValue(a.NetworkId), utils.PtrValue(b.NetworkId))
 		})
 
 		table := tables.NewTable()

internal/cmd/network-interface/list/list_test.go

@@ -246,6 +246,14 @@ func TestOutputProjectResult(t *testing.T) {
 			},
 			wantErr: false,
 		},
+		{
+			name: "two empty NICs in NIC-slice to verify sorting by network id does not break on nil pointers",
+			args: args{
+				outputFormat: print.PrettyOutputFormat,
+				nics:         []iaas.NIC{{}, {}},
+			},
+			wantErr: false,
+		},
 	}
 	p := print.NewPrinter()
 	p.Cmd = NewCmd(&types.CmdParams{Printer: p})