do not log the remove regulation logs when no regulating equipments (#508)

Signed-off-by: Etienne LESOT <[email protected]>

Author: EtienneLt

network-store-iidm-impl/src/main/java/com/powsybl/network/store/iidm/impl/TerminalImpl.java

@@ -702,16 +702,18 @@ public void removeAsRegulatingPoint() {
             }
 
         });
-        String regulatingEquiments = getAttributes().getRegulatingEquipments().stream()
-            .map(RegulatingEquipmentIdentifier::getEquipmentId).collect(Collectors.joining(", "));
-        connectable.getNetwork().getReportNodeContext().getReportNode().newReportNode()
-            .withMessageTemplate("regulatedTerminalDeleted", "${identifiableId} has been deleted and it was regulated. " +
-                "The following regulating equipments have their regulation set to Local : [${regulatingEquipments}] ")
-            .withUntypedValue("identifiableId", connectable.getId())
-            .withUntypedValue("regulatingEquipments", regulatingEquiments)
-            .withSeverity(TypedValue.INFO_SEVERITY)
-            .add();
-        getAttributes().getRegulatingEquipments().clear();
+        if (!getAttributes().getRegulatingEquipments().isEmpty()) {
+            String regulatingEquiments = getAttributes().getRegulatingEquipments().stream()
+                .map(RegulatingEquipmentIdentifier::getEquipmentId).collect(Collectors.joining(", "));
+            connectable.getNetwork().getReportNodeContext().getReportNode().newReportNode()
+                .withMessageTemplate("regulatedTerminalDeleted", "${identifiableId} has been deleted and it was regulated. " +
+                    "The following regulating equipments have their regulation set to Local : [${regulatingEquipments}] ")
+                .withUntypedValue("identifiableId", connectable.getId())
+                .withUntypedValue("regulatingEquipments", regulatingEquiments)
+                .withSeverity(TypedValue.INFO_SEVERITY)
+                .add();
+            getAttributes().getRegulatingEquipments().clear();
+        }
     }
 
     public ReferrerManager<Terminal> getReferrerManager() {