fixed sonarlint issue

Author: a-brandt

src/main/java/com/arangodb/entity/CollectionOptions.java

@@ -68,6 +68,7 @@ public class CollectionOptions {
 	private List<String> shardKeys;
 
 	public CollectionOptions() {
+		// do nothing here
 	}
 
 	public Boolean getWaitForSync() {

src/main/java/com/arangodb/entity/CollectionStatus.java

@@ -27,46 +27,52 @@
  */
 public enum CollectionStatus {
 
-  /**
-   * initial state of a new collection
-   */
-  NEW_BORN_COLLECTION(1),
+	/**
+	 * initial state of a new collection
+	 */
+	NEW_BORN_COLLECTION(1),
 
-  /**
-   * collection is not in memory
-   */
-  UNLOADED(2),
+	/**
+	 * collection is not in memory
+	 */
+	UNLOADED(2),
 
-  /**
-   * collection is in memory
-   */
-  LOADED(3),
+	/**
+	 * collection is in memory
+	 */
+	LOADED(3),
 
-  /**
-   * temporary state of a collection in the process of being unloaded
-   */
-  IN_THE_PROCESS_OF_BEING_UNLOADED(4),
+	/**
+	 * temporary state of a collection in the process of being unloaded
+	 */
+	IN_THE_PROCESS_OF_BEING_UNLOADED(4),
 
-  /**
-   * deleted state
-   */
-  DELETED(5)
-  ;
-  
-  private static class Holder implements Serializable {
-    private static final long serialVersionUID = -7016368432042468015L;
-    private static TreeMap<Integer, CollectionStatus> lookupMap = new TreeMap<Integer, CollectionStatus>();
-  }
-  
-  private final int status;
-  private CollectionStatus(int status) {
-    this.status = status;
-    Holder.lookupMap.put(status, this);
-  }
-  public int status() {
-    return status;
-  }
-  public static CollectionStatus valueOf(int status) {
-    return Holder.lookupMap.get(status);
-  }
+	/**
+	 * deleted state
+	 */
+	DELETED(5);
+
+	private static class Holder implements Serializable {
+		private static final long serialVersionUID = -7016368432042468015L;
+		private static TreeMap<Integer, CollectionStatus> lookupMap = new TreeMap<Integer, CollectionStatus>();
+
+		private Holder() {
+			// do nothing here
+		}
+	}
+
+	private final int status;
+
+	private CollectionStatus(int status) {
+		this.status = status;
+		Holder.lookupMap.put(status, this);
+	}
+
+	public int status() {
+		return status;
+	}
+
+	public static CollectionStatus valueOf(int status) {
+		return Holder.lookupMap.get(status);
+	}
 }

src/main/java/com/arangodb/entity/WarningEntity.java

@@ -32,6 +32,7 @@ public class WarningEntity {
 	String message;
 
 	public WarningEntity() {
+		// do nothing here
 	}
 
 	public WarningEntity(Long code, String message) {