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.boschshc/src/main/java/org/openhab/binding/boschshc/internal/services/AbstractStatelessBoschSHCService.java

@@ -57,8 +57,9 @@ public abstract class AbstractStatelessBoschSHCService extends AbstractBoschSHCS
      */
     public void postAction() throws InterruptedException, TimeoutException, ExecutionException {
         BridgeHandler bridgeHandler = getBridgeHandler();
-        if (bridgeHandler == null)
+        if (bridgeHandler == null) {
             return;
+        }
 
         bridgeHandler.postAction(endpoint);
     }