ADIF file import only works once

[xylo04]

The "Import ADIF file" feature only works reliably the first time it's used; after that the page has to be reloaded, or maybe you can open the file selection and cancel and get it out of it's funk.

There's a JS console log message that's probably relevant:

ERROR TypeError: Failed to execute 'readAsText' on 'FileReader': parameter 1 is not of type 'Blob'.