Improve javadoc for all addons (#15667)

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

bundles/org.openhab.binding.globalcache/src/main/java/org/openhab/binding/globalcache/internal/command/AbstractCommand.java

@@ -217,7 +217,6 @@ public abstract class AbstractCommand implements CommandInterface {
             if (isErrorReply(deviceReply)) {
                 return false;
             }
-
         } catch (InterruptedException e) {
             createGenericError("Poll of response queue was interrupted");
             return false;
@@ -326,7 +325,6 @@ public abstract class AbstractCommand implements CommandInterface {
         int eCode;
         try {
             eCode = Integer.parseInt(errorCode);
-
         } catch (NumberFormatException e) {
             eCode = 0;
             logger.debug("Badly formatted error code '{}' received from device: {}", errorCode, e.getMessage());

bundles/org.openhab.binding.globalcache/src/main/java/org/openhab/binding/globalcache/internal/discovery/MulticastListener.java

@@ -105,7 +105,6 @@ public class MulticastListener {
             beaconFound = true;
             logger.trace("Multicast listener got datagram of length {} from multicast port: {}", msgPacket.getLength(),
                     msgPacket.toString());
-
         } catch (SocketTimeoutException e) {
             beaconFound = false;
         }