fix(color): radio may crash if model yaml file does not contain any screen definitions (#6916)

radio/src/datastructs_model.cpp

@@ -197,6 +197,11 @@ void ModelData::cfsSetOffColorLuaOverride(uint8_t n, bool v) {
 static TopBarPersistentData _topbarData;
 static CustomScreenData* _screenData[MAX_CUSTOM_SCREENS];
 
+bool ModelData::hasScreenData(int screenNum)
+{
+  return _screenData[screenNum] != nullptr;
+}
+
 CustomScreenData* ModelData::getScreenData(int screenNum)
 {
   if (_screenData[screenNum] == nullptr) {

radio/src/datastructs_private.h

@@ -835,6 +835,7 @@ PACK(struct ModelData {
   const char* getScreenLayoutId(int screenNum);
   void setScreenLayoutId(int screenNum, const char* s);
   TopBarPersistentData* getTopbarData();
+  bool hasScreenData(int screenNum);
   CustomScreenData* getScreenData(int screenNum);
   LayoutPersistentData* getScreenLayoutData(int screenNum);
   WidgetPersistentData* getWidgetData(int screenNum, int zoneNum);

radio/src/storage/storage_common.cpp

@@ -161,6 +161,9 @@ static void sanitizeMixerLines()
 void postModelLoad(bool alarms)
 {
 #if defined(COLORLCD)
+  if (!g_model.hasScreenData(0))
+    LayoutFactory::loadDefaultLayout();
+
   if (g_model.topbarWidgetWidth[0] == 0) {
     // Set default width for top bar widgets
     for (int i = 0; i < MAX_TOPBAR_ZONES; i += 1)