Stop needlessly outputting 0 value allocation amounts

src/overhead_allocation.rs

@@ -704,6 +704,7 @@ fn solve_reciprocal_no_from(
                                            //     cost.value / new_cost * diff
                                            // },
                     })
+                    .filter(|cost| cost.value != 0_f64)
                     .collect(),
             }
         })
@@ -749,6 +750,7 @@ fn solve_reciprocal_with_from<T: ReciprocalAllocationSolver + Sync + Send>(
                         value: value,
                         from_cost_centre: department.clone(),
                     })
+                    .filter(|cost| cost.value != 0_f64)
                     .collect::<Vec<MovedAmount>>()
             })
             .collect();