Fix SAT warnings (#14202)

* Fix SAT warnings

- checkstyle.ModifierOrderCheck
- checkstyle.OneStatementPerLineCheck
- checkstyle.NeedBracesCheck
- PMD.UseStandardCharsets
- PMD.UseCollectionIsEmpty
- PMD.UnusedLocalVariable
- PMD.SimplifyBooleanReturns where reasonable, suppress where
readability is better without change
- PMD.SimplifyBooleanExpressions

* Include StandardCharsets

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

bundles/org.openhab.binding.homematic/src/main/java/org/openhab/binding/homematic/internal/communicator/client/RpcClient.java

@@ -131,8 +131,9 @@ public abstract class RpcClient<T> {
      * Disposes the client.
      */
     public void dispose() {
-        if (future != null)
+        if (future != null) {
             future.cancel(true);
+        }
     }
 
     /**

bundles/org.openhab.binding.homematic/src/main/java/org/openhab/binding/homematic/internal/type/HomematicTypeGeneratorImpl.java

@@ -335,7 +335,7 @@ public class HomematicTypeGeneratorImpl implements HomematicTypeGenerator {
                                     ParameterOption defaultOption = options.get(offset);
                                     logger.trace("Changing default option to {} (offset {})", defaultOption, offset);
                                     builder.withDefault(defaultOption.getValue());
-                                } else if (options.size() > 0) {
+                                } else if (!options.isEmpty()) {
                                     ParameterOption defaultOption = options.get(0);
                                     logger.trace("Changing default option to {} (first value)", defaultOption);
                                     builder.withDefault(defaultOption.getValue());