Minor code improvements and formatting

Author: benct

src/entity.js

@@ -67,7 +67,7 @@ export const entityStateDisplay = (hass, stateObj, config) => {
         } else if (config.format === 'celsius_to_fahrenheit') {
             value = formatNumber(value * 1.8 + 32, hass.locale, { maximumFractionDigits: 0 });
         } else if (config.format === 'fahrenheit_to_celsius') {
-            value = formatNumber((value - 32) * 5 / 9, hass.locale, { maximumFractionDigits: 1 }); 
+            value = formatNumber(((value - 32) * 5) / 9, hass.locale, { maximumFractionDigits: 1 });
         }
         return `${value}${unit ? ` ${unit}` : ''}`;
     }

src/index.js

@@ -134,7 +134,9 @@ class MultipleEntityRow extends LitElement {
             ></ha-relative-time>`;
         }
         if (config.format && TIMESTAMP_FORMATS.includes(config.format)) {
-            const value = config.attribute ? stateObj.attributes[config.attribute] : stateObj.state;
+            const value = config.attribute
+                ? stateObj.attributes[config.attribute] ?? stateObj[config.attribute]
+                : stateObj.state;
             const timestamp = new Date(value);
             if (!(timestamp instanceof Date) || isNaN(timestamp.getTime())) {
                 return value;