Fix/suppress PMD CompareObjectsWithEquals findings (#11476)

Newer PMD versions discover more CompareObjectsWithEquals findings.

Related to https://github.com/openhab/static-code-analysis/pull/423

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

bundles/org.openhab.binding.atlona/src/main/java/org/openhab/binding/atlona/internal/net/SocketChannelSession.java

@@ -319,6 +319,7 @@ public class SocketChannelSession implements SocketSession {
          * Stops the reader. Will wait 5 seconds for the runnable to stop (should stop within 1 second based on the poll
          * timeout below)
          */
+        @SuppressWarnings("PMD.CompareObjectsWithEquals")
         public void stopRunning() {
             if (isRunning.getAndSet(false)) {
                 // only wait if stopRunning didn't get called as part of processing a message

bundles/org.openhab.binding.atlona/src/main/java/org/openhab/binding/atlona/internal/pro3/AtlonaPro3PortocolHandler.java

@@ -1088,7 +1088,7 @@ class AtlonaPro3PortocolHandler {
 
         @Override
         public void responseReceived(String response) {
-            if (response == null || response == "") {
+            if (response == null || response.isEmpty()) {
                 return;
             }