SyntaxError on statement without body (#6854)

According to the Rules of Automatic Semicolon Insertion:

"a semicolon is never inserted automatically if the semicolon would then be parsed as an empty statement"

Fix #6351
Fix #6553 (Closed as duplicate)
Fix #5128

Author: ShortDevelopment

lib/Parser/Parse.cpp

@@ -1,6 +1,6 @@
 //-------------------------------------------------------------------------------------------------------
 // Copyright (C) Microsoft. All rights reserved.
-// Copyright (c) 2021 ChakraCore Project Contributors. All rights reserved.
+// Copyright (c) ChakraCore Project Contributors. All rights reserved.
 // Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
 //-------------------------------------------------------------------------------------------------------
 #include "ParserPch.h"
@@ -10170,13 +10170,9 @@ ParseNodePtr Parser::ParseStatement()
     {
     case tkEOF:
         if (labelledStatement)
-        {
             Error(ERRLabelFollowedByEOF);
-        }
-        if (buildAST)
-        {
-            pnode = nullptr;
-        }
+        else
+            Error(ERRsyntaxEOF);
         break;
 
     case tkFUNCTION:

lib/Parser/perrors.h

@@ -1,5 +1,6 @@
 //-------------------------------------------------------------------------------------------------------
 // Copyright (C) Microsoft. All rights reserved.
+// Copyright (c) ChakraCore Project Contributors. All rights reserved.
 // Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
 //-------------------------------------------------------------------------------------------------------
 // parser error messages
@@ -8,6 +9,7 @@
 
 LSC_ERROR_MSG(1001, ERRnoMemory      , "Out of memory")
 LSC_ERROR_MSG(1002, ERRsyntax        , "Syntax error")
+LSC_ERROR_MSG(1104, ERRsyntaxEOF     , "Unexpected end of script.")
 LSC_ERROR_MSG(1003, ERRnoColon       , "Expected ':'")
 LSC_ERROR_MSG(1004, ERRnoSemic       , "Expected ';'")
 LSC_ERROR_MSG(1005, ERRnoLparen      , "Expected '('")
@@ -116,7 +118,9 @@ LSC_ERROR_MSG(1100, ERRUndeclaredExportName, "Export of name '%s' which has no l
 LSC_ERROR_MSG(1101, ERRModuleImportOrExportInScript, "'import' or 'export' can only be used in module code.")
 LSC_ERROR_MSG(1102, ERRInvalidAsgTarget, "Invalid left-hand side in assignment.")
 LSC_ERROR_MSG(1103, ERRMissingFrom, "Expected 'from' after import or export clause.")
-//1104-1199 available for future use
+
+// 1104 ERRsyntaxEOF
+// 1105-1199 available for future use
 
 // Generic errors intended to be re-usable
 LSC_ERROR_MSG(1200, ERRKeywordAfter, "Unexpected keyword '%s' after '%s'")