[PATCH] ShellPkg/UefiShellCommandLib: Do not error-exit when PlatformLang is missing.

["Marvin Häuser" <Marvin.Haeuser@outlook.com>]

Currently, when the PlatformLang variable is missing,
UefiShellCommandLib error-exits. To prevent the entire UEFI Shell
from failing to load over a missing variable, "en-US" is assumed when
the variable location fails.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Marvin Haeuser <Marvin.Haeuser@outlook.com>
---
 ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.c b/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.c
index 0df252b42036..dfcfd2e0dd54 100644
--- a/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.c
+++ b/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.c
@@ -81,9 +81,6 @@ CommandInit(
   CHAR8                           *PlatformLang;
   
   GetEfiGlobalVariable2 (EFI_PLATFORM_LANG_VARIABLE_NAME, (VOID**)&PlatformLang, NULL);
-  if (PlatformLang == NULL) {
-    return EFI_UNSUPPORTED;
-  }
 
   if (gUnicodeCollation == NULL) {
     Status = gBS->LocateHandleBuffer (
@@ -120,7 +117,7 @@ CommandInit(
       BestLanguage = GetBestLanguage (
                        Uc->SupportedLanguages,
                        FALSE,
-                       PlatformLang,
+                       ((PlatformLang != NULL) ? PlatformLang : "en-US"),
                        NULL
                        );
       if (BestLanguage != NULL) {
@@ -132,7 +129,9 @@ CommandInit(
     if (Handles != NULL) {
       FreePool (Handles);
     }
-    FreePool (PlatformLang);
+    if (PlatformLang != NULL) {
+      FreePool (PlatformLang);
+    }
   }
 
   return (gUnicodeCollation == NULL) ? EFI_UNSUPPORTED : EFI_SUCCESS;
-- 
2.17.0.windows.1