fix: do not printPolicy if logs disabled (casbin#302)

Author: Nchalenko

src/main/java/org/casbin/jcasbin/main/CoreEnforcer.java

@@ -258,7 +258,9 @@ public void loadPolicy() {
         model.sortPoliciesByPriority();
 
         clearRmMap();
-        model.printPolicy();
+        if (Util.enableLog) {
+            model.printPolicy();
+        }
         if (autoBuildRoleLinks) {
             buildRoleLinks();
         }
@@ -285,7 +287,9 @@ public void loadFilteredPolicy(Object filter) {
         model.sortPoliciesByPriority();
 
         initRmMap();
-        model.printPolicy();
+        if (Util.enableLog) {
+            model.printPolicy();
+        }
         if (autoBuildRoleLinks) {
             buildRoleLinks();
         }