add missing null checks

Author: paul-szczepanek-arm

features/FEATURE_BLE/source/generic/GenericGap.cpp

@@ -1782,7 +1782,8 @@ void GenericGap::on_disconnection_complete(const pal::GapDisconnectionCompleteEv
 void GenericGap::on_connection_parameter_request(const pal::GapRemoteConnectionParameterRequestEvent &e)
 {
     if (_user_manage_connection_parameter_requests) {
-        _eventHandler->onUpdateConnectionParametersRequest(
+        if (_eventHandler) {
+            _eventHandler->onUpdateConnectionParametersRequest(
                 UpdateConnectionParametersRequestEvent(
                     e.connection_handle,
                     conn_interval_t(e.min_connection_interval),
@@ -1791,6 +1792,7 @@ void GenericGap::on_connection_parameter_request(const pal::GapRemoteConnectionP
                     supervision_timeout_t(e.supervision_timeout)
                 )
             );
+        }
     } else {
         _pal_gap.accept_connection_parameter_request(
             e.connection_handle,
@@ -1806,6 +1808,10 @@ void GenericGap::on_connection_parameter_request(const pal::GapRemoteConnectionP
 
 void GenericGap::on_connection_update(const pal::GapConnectionUpdateEvent &e)
 {
+    if (!_eventHandler) {
+        return;
+    }
+
     _eventHandler->onConnectionParametersUpdateComplete(
         ConnectionParametersUpdateCompleteEvent(
             e.status == pal::hci_error_code_t::SUCCESS ? BLE_ERROR_NONE : BLE_ERROR_UNSPECIFIED,