MSI: Fix retrieval of nul records as strings

[Mike McCormack]

ChangeLog:
* Fix retrieval of nul records as strings
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diff -ur dlls/msi.old/record.c dlls/msi/record.c
--- dlls/msi.old/record.c	2004-06-29 07:47:52.000000000 -0500
+++ dlls/msi/record.c	2004-06-29 07:48:52.000000000 -0500
@@ -261,6 +261,10 @@
         WideCharToMultiByte( CP_ACP, 0, rec->fields[iField].u.szwVal, -1,
                              szValue, *pcchValue, NULL, NULL);
         break;
+    case MSIFIELD_NULL:
+        len = 1;
+        if( *pcchValue > 0 )
+            szValue[0] = 0;
     default:
         ret = ERROR_INVALID_PARAMETER;
         break;
@@ -319,6 +323,10 @@
         len = lstrlenW( rec->fields[iField].u.szwVal );
         lstrcpynW(szValue, rec->fields[iField].u.szwVal, *pcchValue);
         break;
+    case MSIFIELD_NULL:
+        len = 1;
+        if( *pcchValue > 0 )
+            szValue[0] = 0;
     default:
         break;
     }