Fix transport_maps function for non-existent domains The postfix_transport_maps function had a bug causing 2012-04-15 17:40:22 CEST LOG: statement: SELECT transport FROM postfix_transport_map('logcheck', 'domine.madduck.net'); 2012-04-15 17:40:22 CEST ERROR: query returned no rows when the domain was not in the database. This would make did be NULL and make the query fail. This patch moves the tid query until after a check for did. If the latter is NULL, the function RETURNs (rather than fails).

668951708f2f28f49da94479a89c40ab8c8a9b01 trunk
668951708f2f28f49da94479a89c40ab8c8a9b01 vmm-0.4
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bc41dfcef0ad915ccca987b1b381d8c68ab70f2f vmm-0.5
dc98cc162c66d8a5227b6e7c5e7215757159688c vmm-0.5.1
3e972996da7f135f0a91afaea831befbac4c3351 vmm-0.5.2
668951708f2f28f49da94479a89c40ab8c8a9b01 trunk
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