Waveform Task Configuration Issue 1: Selecting a Task that isn't assigned to a DAQ card yet

[adchurch]

If you select a Waveform Task with this custom device before assigning that task to a DAQ Waveform Section a cryptic error is thrown though the plugin can still be configured after clearing the error.

Better behavior would be to check whether a Waveform Task is assigned to any DAQ Waveform sections and provide feedback if not.