msi: Return ERROR_SUCCESS if the PackageName property is not present.

dlls/msi/source.c

@@ -344,7 +344,7 @@ UINT WINAPI MsiSourceListGetInfoW( LPCWSTR szProduct, LPCWSTR szUserSid,
         rc = RegQueryValueExW(sourcekey, INSTALLPROPERTY_PACKAGENAMEW, 0, 0, 
                 (LPBYTE)szValue, pcchValue);
         if (rc != ERROR_SUCCESS && rc != ERROR_MORE_DATA)
-            rc = ERROR_UNKNOWN_PROPERTY;
+            rc = ERROR_SUCCESS;
     }
     else
     {

dlls/msi/tests/source.c

@@ -208,9 +208,9 @@ static void test_MsiSourceListGetInfo(void)
     size = 0xdeadbeef;
     r = MsiSourceListGetInfoA(prodcode, usersid, MSIINSTALLCONTEXT_USERUNMANAGED,
                               MSICODE_PRODUCT, INSTALLPROPERTY_PACKAGENAME, NULL, &size);
+    ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", r);
     todo_wine
     {
-        ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", r);
         ok(size == 0, "Expected 0, got %d\n", size);
     }