am: Return StubApplet instead of nullptr when AppletId not found

src/core/hle/service/am/am.cpp

@@ -6,8 +6,6 @@
 #include <cinttypes>
 #include <cstring>
 #include <stack>
-#include "applets/applets.h"
-#include "applets/software_keyboard.h"
 #include "audio_core/audio_renderer.h"
 #include "core/core.h"
 #include "core/hle/ipc_helpers.h"
@@ -18,6 +16,9 @@
 #include "core/hle/service/am/am.h"
 #include "core/hle/service/am/applet_ae.h"
 #include "core/hle/service/am/applet_oe.h"
+#include "core/hle/service/am/applets/applets.h"
+#include "core/hle/service/am/applets/software_keyboard.h"
+#include "core/hle/service/am/applets/stub_applet.h"
 #include "core/hle/service/am/idle.h"
 #include "core/hle/service/am/omm.h"
 #include "core/hle/service/am/spsm.h"
@@ -761,8 +762,9 @@ static std::shared_ptr<Applets::Applet> GetAppletFromId(AppletId id) {
     case AppletId::SoftwareKeyboard:
         return std::make_shared<Applets::SoftwareKeyboard>();
     default:
-        UNREACHABLE_MSG("Unimplemented AppletId [{:08X}]!", static_cast<u32>(id));
-        return nullptr;
+        LOG_ERROR(Service_AM, "Unimplemented AppletId [{:08X}]! -- Falling back to stub!",
+                  static_cast<u32>(id));
+        return std::make_shared<Applets::StubApplet>();
     }
 }
 

src/core/hle/service/am/applets/stub_applet.cpp

@@ -2,7 +2,12 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <string>
+
 #include "common/hex_util.h"
+#include "common/logging/log.h"
+#include "core/hle/result.h"
+#include "core/hle/service/am/am.h"
 #include "core/hle/service/am/applets/stub_applet.h"
 
 namespace Service::AM::Applets {

src/core/hle/service/am/applets/stub_applet.h

@@ -4,13 +4,6 @@
 
 #pragma once
 
-#include <array>
-#include <string>
-#include <vector>
-
-#include "common/common_funcs.h"
-#include "common/swap.h"
-#include "core/hle/service/am/am.h"
 #include "core/hle/service/am/applets/applets.h"
 
 namespace Service::AM::Applets {