OcMiscLib: Align LoadedImage with Shell behaviour for no arguments

Changelog.md

@@ -55,6 +55,7 @@ OpenCore Changelog
 - Improved OpenCanopy pointer acceleration
 - Added more precise control on `AppleEvent` protocol properties and features
 - Added dynamic keyboard protocol installation on CrScreenshotDxe
+- Support starting UEFI tools with argument support (e.g. `ControlMsrE2`) without arguments from picker
 
 #### v0.6.7
 - Fixed ocvalidate return code to be non-zero when issues are found

Library/OcMiscLib/ProtocolSupport.c

@@ -27,6 +27,8 @@ GetArguments (
   OUT CHAR16  ***Argv
   )
 {
+  STATIC CHAR16 *StArgv[2] = { L"Self", NULL };
+
   EFI_STATUS                     Status;
   EFI_SHELL_PARAMETERS_PROTOCOL  *ShellParameters;
   EFI_LOADED_IMAGE_PROTOCOL      *LoadedImage;
@@ -47,11 +49,17 @@ GetArguments (
     &gEfiLoadedImageProtocolGuid,
     (VOID **) &LoadedImage
     );
+
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_WARN, "OCM: LoadedImage cannot be located - %r\n", Status));
+  }
+
   if (EFI_ERROR (Status) || LoadedImage->LoadOptions == NULL) {
-    return EFI_NOT_FOUND;
+    *Argc = 1;
+    *Argv = StArgv;
+    return EFI_SUCCESS;
   }
 
-  STATIC CHAR16 *StArgv[2] = { L"Self", NULL };
   StArgv[1] = LoadedImage->LoadOptions;
   *Argc = ARRAY_SIZE (StArgv);
   *Argv = StArgv;