[fix] core: revert regression introduce by commit 1fc6292c

lib/core/core/src/router.rs

@@ -215,8 +215,8 @@ fn start_broadcasting_thread(
                 RecvTimeoutError::Disconnected => fatal_error!("router thread disconnnected !"),
             },
         }
-        if let Some(expected_regs_count) = expected_registrations_count {
-            if registrations_count < expected_regs_count
+        if (expected_registrations_count.is_none()
+            || registrations_count < unwrap::unwrap!(expected_registrations_count))
             && SystemTime::now()
                 .duration_since(start_time)
                 .expect("Duration error !")
@@ -226,13 +226,7 @@ fn start_broadcasting_thread(
             fatal_error!(
                 "{} modules have registered, but expected {} !",
                 registrations_count,
-                    expected_regs_count
-                );
-            }
-        } else {
-            fatal_error!(
-                "{} modules have registered, but none expected !",
-                registrations_count
+                expected_registrations_count.unwrap_or(0)
             );
         }
     }