By Nina Chestney LONDON (Reuters) – Europe is on edge about the restart of the Nord Stream 1 gas pipeline from Russia after annual maintenance is set to end on Thursday, with governments bracing for possible further supply cuts. A planned outage on the biggest single pipeline carrying Russian gas to Germany started on July 11 and is expected to end at 0600 CET (0400 GMT) on July 21. It transports 55 billion cubic metres (bcm) a year of gas under the Baltic Sea. If the outage is extended, the operator Nord Stream AG should make that clear on its website, where the flows section would indicate e…