regression bugfix: import/export configuration broken due to nw.js bug #52
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The import/export configuration functionality silently fails since b93078f and simply does nothing when hitting the buttons. Digging deeper, it throws an "Invalid calling page. This function can't be called from a background page." error.
The reason is a bug in nw.js already reported on nwjs/nw.js#7349 and happens from nw.js 0.42.4.
Hence, the import/export functionality is currently unusable with nw.js >0.42.3 as integrated in b93078f.
This bugfix therefore reverts the nw.js version to the last known-to-work one (0.42.3) and also adds a terminal error message to catch this regression in case it appears again.