real assert() to bail out on invalid index

... instead of displaying a message and then silently poking memory that
we don't own. Now that globstr.hrc is renumbered it makes sense to
prevent future inconsistencies.

Change-Id: I7458fbca4928b33fc7471820aeea7882a0f71e50

sc/source/core/data/global.cxx

@@ -346,7 +346,7 @@ void ScGlobal::SetUserList( const ScUserList* pNewList )
 
 const OUString& ScGlobal::GetRscString( sal_uInt16 nIndex )
 {
-    OSL_ENSURE( nIndex < SC_GLOBSTR_STR_COUNT, "ScGlobal::GetRscString - invalid string index");
+    assert( nIndex < SC_GLOBSTR_STR_COUNT);
     if( !ppRscString[ nIndex ] )
     {
         OpCode eOp = ocNone;