No distributor dialog clarify

[karmanyaahm]

Clarify that it's no distributor with required features, not just no distributor. This might also be the case with android I haven't checked

[p1gp1g]

We should check there [1] if there is any distributor without feature to differentiate the 2 cases then

[1] https://github.com/UnifiedPush/flutter-connector/blob/main/unifiedpush/lib/unifiedpush.dart#L32