nav fixes

selfdrive/ui/onroad/starpilot/navigation_card.py

@@ -168,6 +168,9 @@ class NavigationCardRenderer(Widget):
     if not self._enabled:
       return
 
+    if not (ui_state.params.get("NavDestination") or ""):
+      return
+
     raw_state = ui_state.params_memory.get("NavInstructionState") or {}
     if isinstance(raw_state, str):
       try:

selfdrive/ui/qt/onroad/hud.cc

@@ -107,6 +107,10 @@ void HudRenderer::updateState(const UIState &s) {
     return;
   }
 
+  if (params.get("NavDestination").empty()) {
+    return;
+  }
+
   const std::string nav_state_raw = params_memory.get("NavInstructionState");
   if (nav_state_raw.empty()) {
     return;

selfdrive/ui/qt/onroad/onroad_home.cc

@@ -114,6 +114,7 @@ void OnroadWindow::paintEvent(QPaintEvent *event) {
 
 void OnroadWindow::mousePressEvent(QMouseEvent* mouseEvent) {
   if (nvg->handleHudPress(mouseEvent->pos())) {
+    grabMouse();
     mouseEvent->accept();
     return;
   }
@@ -129,7 +130,12 @@ void OnroadWindow::mousePressEvent(QMouseEvent* mouseEvent) {
 }
 
 void OnroadWindow::mouseReleaseEvent(QMouseEvent* mouseEvent) {
-  if (nvg->handleHudRelease(mouseEvent->pos())) {
+  const bool handled = nvg->handleHudRelease(mouseEvent->pos());
+  if (QWidget::mouseGrabber() == this) {
+    releaseMouse();
+  }
+
+  if (handled) {
     mouseEvent->accept();
     return;
   }