Use Collection.isEmpty (#10525)

Fixes 47 SAT UseCollectionIsEmpty findings.

Signed-off-by: Wouter Born <github@maindrain.net>

bundles/org.openhab.binding.vigicrues/src/main/java/org/openhab/binding/vigicrues/internal/handler/VigiCruesHandler.java

@@ -243,7 +243,7 @@ public class VigiCruesHandler extends BaseThingHandler {
     }
 
     private void updateRelativeMeasure(String channelId, List<QuantityType<?>> reference, double value) {
-        if (reference.size() > 0) {
+        if (!reference.isEmpty()) {
             double percent = value / reference.get(0).doubleValue() * 100;
             updateQuantity(channelId, percent, Units.PERCENT);
         }