made parent empty lines hidden

dispatcher/static/table.js

@@ -241,6 +241,7 @@ class Table {
                 }
             })
 
+            if (parentDurations.reduce((a, b) => a + b, 0) !== 0) {
                 this.addProject(
                     parent.id,
                     parent.name,
@@ -253,6 +254,7 @@ class Table {
                 projects.filter(p => p.total !== 0).forEach(project => {
                     this.addProject(project.id, project.name, "", project.durations)
                 })
+            }
         })
         this.updateTotals()
     }