fix silly bug in is_empty

Author: ljeub-pometry

raphtory/src/db/api/view/internal/time_semantics/filtered_edge.rs

@@ -109,7 +109,7 @@ impl<'a, TS: TimeIndexOps<'a, IndexType = EventTime, RangeType = TS>, G: GraphVi
 
     fn is_empty(&self) -> bool {
         if self.view.internal_exploded_edge_filtered() {
-            self.clone().iter().next().is_some()
+            self.clone().iter().next().is_none()
         } else {
             self.time_index.is_empty()
         }

raphtory/tests/exploded_edge_property_filter.rs

@@ -348,6 +348,15 @@ fn test_filter_eq() {
     })
 }
 
+#[test]
+fn test_filter_eq_one_edge() {
+    let g = Graph::new();
+    g.add_edge(0, 0, 0, [("int_prop", Prop::I64(0))], None)
+        .unwrap();
+    let filter = ExplodedEdgeFilter.property("int_prop").eq(0i64);
+    assert_graph_equal(&g.filter(filter.clone()).unwrap(), &g);
+}
+
 #[test]
 fn test_filter_eq_persistent() {
     proptest!(|(