MSI: ITERATE_WriteRegistryValues component null check

[Johan Dahlin]

This adds a null check for component.

Together with my last patch makes the Python 2.4.1 msi install under wine 
(unattended install).
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Index: action.c
===================================================================
RCS file: /home/wine/wine/dlls/msi/action.c,v
retrieving revision 1.181
diff -u -B -p -u -r1.181 action.c
--- action.c	23 Aug 2005 18:15:44 -0000	1.181
+++ action.c	24 Aug 2005 00:02:48 -0000
@@ -1992,6 +1992,8 @@ static UINT ITERATE_WriteRegistryValues(
 
     component = MSI_RecordGetString(row, 6);
     comp = get_loaded_component(package,component);
+    if (!comp)
+        return ERROR_SUCCESS;
 
     if (!ACTION_VerifyComponentForAction(package, comp, INSTALLSTATE_LOCAL))
     {
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