Remove constraint that lot.account_guid must not be null. Unfortunately,

sqlite doesn't support ALTER TABLE which modifies column constraints, so
existing databases can't be modified programmatically.



git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@17503 57a11ea4-9604-0410-9ed3-97b8803252fd

src/backend/sql/gnc-lots-sql.c

@@ -50,7 +50,7 @@ static void set_lot_is_closed( gpointer pObject, gboolean value );
 static const GncSqlColumnTableEntry col_table[] =
 {
     { "guid",         CT_GUID,    0, COL_NNUL|COL_PKEY, "guid" },
-    { "account_guid", CT_GUID,    0, COL_NNUL,          NULL, NULL, get_lot_account,   set_lot_account },
+    { "account_guid", CT_GUID,    0, 0,                 NULL, NULL, get_lot_account,   set_lot_account },
     { "is_closed",    CT_BOOLEAN, 0, COL_NNUL,          NULL, NULL,
 		(QofAccessFunc)gnc_lot_is_closed, (QofSetterFunc)set_lot_is_closed },
     { NULL }