fix console show with empty full name

[MichaelDvP]

But maybe the point: // 4. for MQTT we want to always show the special HA entities (they have an empty fullname)
is obsolete. We have only the climate entitiy, which is only needed to create the ha-config, a publish is not needed.
Then we can reduce to: bool visible = ((dv.has_state(DeviceValueState::DV_VISIBLE) && dv.full_name)

[proddy]

yes. makes sense.

Remind me, I do need to find some time to start on improving the customization feature to set flags for MQTT and read-only (#317).

[MichaelDvP]

If you want to add the visibility-flags to 3.4 should we wait with this for the extra flags? It will get something like:

        bool conditions = ((tag_filter == DeviceValueTAG::TAG_NONE) || (tag_filter == dv.tag)) && dv.has_state(DeviceValueState::DV_ACTIVE) && dv.full_name;
        bool visible    = (dv.has_state(DeviceValueState::DV_MQTT) && (output_target == OUTPUT_TARGET::MQTT)) 
                       || (dv.has_state(DeviceValueState::DV_INFO) && (output_target == OUTPUT_TARGET::API_VERBOSE))
                       || (dv.has_state(DeviceValueState::DV_VALUE) && (output_target == OUTPUT_TARGET::API_SHORTNAME));

or as first step only remove the mqtt publish for fullname.empty?