Keep empty region previews blank

src/player/regions/weather.js

@@ -69,6 +69,8 @@ function substituteWeatherVariables(html, value) {
 }
 
 function renderWeatherRegion(region, regionContent) {
+  var value = String(regionContent && regionContent.value || '');
+  if (!value.trim()) return '';
   var location = getWeatherLocation(regionContent && regionContent.weather_location_id);
   var snapshot = location && location.responseJson && typeof location.responseJson === 'object' ? location.responseJson : null;
   var width = Math.max(1, Math.round(Number(region && region.pixelWidth) || 1));
@@ -77,7 +79,6 @@ function renderWeatherRegion(region, regionContent) {
   var style = 'width:' + width + 'px;height:' + height + 'px;transform:scale(' + scale + ');transform-origin:top left;overflow:hidden;';
   if (!location || !snapshot) return '<div class="template-region weather" style="' + region.baseStyle + '"><div style="' + style + '"></div></div>';
   var current = snapshot.current || {};
-  var value = String(regionContent && regionContent.value || '');
   if (value) {
     var weatherData = withWeatherUnits(snapshot, location);
     var fontSize = Math.max(8, Number(regionContent && regionContent.font_size || region && (region.font_size || region.fontSize) || 32) || 32);