no need to create template relation if there is already one owned

docs/backend_api/becca_entities_abstract_entity.js.html

@@ -42,16 +42,19 @@ let becca = null;
  * Base class for all backend entities.
  */
 class AbstractEntity {
+    /** @protected */
     beforeSaving() {
         this.generateIdIfNecessary();
     }
 
+    /** @protected */
     generateIdIfNecessary() {
         if (!this[this.constructor.primaryKeyName]) {
             this[this.constructor.primaryKeyName] = utils.newEntityId();
         }
     }
 
+    /** @protected */
     generateHash(isDeleted = false) {
         let contentToHash = "";
 
@@ -66,10 +69,12 @@ class AbstractEntity {
         return utils.hash(contentToHash).substr(0, 10);
     }
 
+    /** @protected */
     getUtcDateChanged() {
         return this.utcDateModified || this.utcDateCreated;
     }
 
+    /** @protected */
     get becca() {
         if (!becca) {
             becca = require('../becca');
@@ -78,6 +83,7 @@ class AbstractEntity {
         return becca;
     }
 
+    /** @protected */
     addEntityChange(isDeleted = false) {
         entityChangesService.addEntityChange({
             entityName: this.constructor.entityName,
@@ -89,6 +95,7 @@ class AbstractEntity {
         });
     }
 
+    /** @protected */
     getPojoToSave() {
         return this.getPojo();
     }