{"action":"opened","issue":{"url":"https://api.github.com/repos/mantidproject/mantid/issues/16723","repository_url":"https://api.github.com/repos/mantidproject/mantid","labels_url":"https://api.github.com/repos/mantidproject/mantid/issues/16723/labels{/name}","comments_url":"https://api.github.com/repos/mantidproject/mantid/issues/16723/comments","events_url":"https://api.github.com/repos/mantidproject/mantid/issues/16723/events","html_url":"https://github.com/mantidproject/mantid/issues/16723","id":162141347,"number":16723,"title":"Muon Analysis: load dead times for older 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3.8","description":"","creator":{"login":"granrothge","id":5910574,"avatar_url":"https://avatars.githubusercontent.com/u/5910574?v=3","gravatar_id":"","url":"https://api.github.com/users/granrothge","html_url":"https://github.com/granrothge","followers_url":"https://api.github.com/users/granrothge/followers","following_url":"https://api.github.com/users/granrothge/following{/other_user}","gists_url":"https://api.github.com/users/granrothge/gists{/gist_id}","starred_url":"https://api.github.com/users/granrothge/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/granrothge/subscriptions","organizations_url":"https://api.github.com/users/granrothge/orgs","repos_url":"https://api.github.com/users/granrothge/repos","events_url":"https://api.github.com/users/granrothge/events{/privacy}","received_events_url":"https://api.github.com/users/granrothge/received_events","type":"User","site_admin":false},"open_issues":631,"closed_issues":204,"state":"open","created_at":"2016-01-13T20:00:53Z","updated_at":"2016-06-24T12:58:09Z","due_on":"2016-10-09T23:00:00Z","closed_at":null},"comments":0,"created_at":"2016-06-24T12:58:09Z","updated_at":"2016-06-24T12:58:09Z","closed_at":null,"body":"#### Expected behaviour\r\nLoading data in MuonAnalysis should succeed, no matter which combination of options are chosen.\r\nIf it does fail, this shouldn't mess up the next attempt.\r\n\r\n#### Actual behaviour\r\nCannot load some older data (converted to NeXus from older format) under certain conditions - see below\r\n\r\n#### Steps to reproduce the behaviour\r\n- Dataset: `\\\\olympic\\babylon5\\Scratch\\TomPerkins\\Data\\keren_data\\53590.NXS` (old MUT data)\r\n- Open Muon Analysis interface\r\n- Set \"Dead Time Correction\" dropdown to *None*\r\n- Load the data\r\n  - Data loads OK and a plot is shown\r\n- Now set \"Dead Time Correction\" to *From Data File*\r\n  - Data cannot be loaded and an error dialog is shown. Details in log:\r\n![mutlog](https://cloud.githubusercontent.com/assets/15363125/16338212/2639a340-3a13-11e6-8439-86ca5dc58750.PNG)\r\n- Change the dropdown back to *None*. This doesn't help and you get an exception `add : Unable to insert Data Object : 'MuonAnalysisGrouped'`. Closing and reopening the interface also doesn't help, you have to restart Mantid to continue. \r\n\r\n#### Cause\r\nThe number of good frames (goodfrm) is not stored in the file, so the data can't be loaded with this option. However the error should be handled more gracefully and the message given to the user should be clearer.\r\n\r\n\r\n"}}
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