Improvements and fixes

Lists and details for plant components open again when one of their values cannot be calculated. Inverters also count as communicating for 48 hours after their last data.

• Lists and details for inverters, combiner boxes, strings, feed-in meters and irradiation sensors open again when one of a component's values cannot be calculated.
• The monitor and the inverter table on the production page now show an inverter as communicating if it sent data within the last 48 hours.