kcms/tablet: Disable tablet tester when no devices are connected
I forgot to add a check for this when originally testing the feature, but since this tester only works with pen input - it doesn't make much sense to open it unless you have pen input.
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I forgot to add a check for this when originally testing the feature, but since this tester only works with pen input - it doesn't make much sense to open it unless you have pen input.