T8343: GUI should report some kind of error if no device is connected

[Simon Redman]

sredman created this task.
sredman triaged this task as "High" priority.
sredman added a project: KDE Connect.

TASK DESCRIPTION
  For example, trying to click the send button should present some kind of error or the send button should be disabled with a note that a device needs to be selected. Currently the only indication is an obscure error on the command line.

TASK DETAIL
  https://phabricator.kde.org/T8343

To: sredman
Cc: #kde_connect, sredman, adeen-s, SemperPeritus, ahmedbesbes, daniel.z.tg, jeanv, seebauer, bugzy, MayeulC, menasshock, ach, apol
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