hvac_action attribute stays in "heating" state even if Better Thermostat is turned off

[Ashpork]

Remove check for an empty hvac_action

Motivation:

This is in relation to #1193 , after the changes made previously in this thread were made and 1.5 was released. I still have HVAC_action staying as heating, when the device state is off and the set temp is higher than current temp.

Changes:

Remove a check for the current hvac_action to be none before the rest of the normal logic kicks in.

Related issue (check one):

• fixes hvac_action attribute stays in "heating" state even if Better Thermostat is turned off. #1193
• there is no related issue ticket

Checklist (check one):

• I did not change any code (e.g. documentation changes)
• The code change is tested and works locally.