Always use multiple types if present. If not present - use singular type

common/data/src/main/java/org/thingsboard/server/common/data/query/AssetTypeFilter.java

@@ -38,10 +38,7 @@ public class AssetTypeFilter implements EntityFilter {
     private List<String> assetTypes;
 
     public List<String> getAssetTypes() {
-        if (assetType != null) {
-            assetTypes = Collections.singletonList(assetType);
-        }
-        return assetTypes;
+        return !CollectionUtils.isEmpty(assetTypes) ? assetTypes : Collections.singletonList(assetType);
     }
 
     @Getter

common/data/src/main/java/org/thingsboard/server/common/data/query/DeviceTypeFilter.java

@@ -42,10 +42,7 @@ public class DeviceTypeFilter implements EntityFilter {
     private List<String> deviceTypes;
 
     public List<String> getDeviceTypes() {
-        if (deviceType != null) {
-            deviceTypes = Collections.singletonList(deviceType);
-        }
-        return deviceTypes;
+        return !CollectionUtils.isEmpty(deviceTypes) ? deviceTypes : Collections.singletonList(deviceType);
     }
 
     @Getter

common/data/src/main/java/org/thingsboard/server/common/data/query/EdgeTypeFilter.java

@@ -38,10 +38,7 @@ public class EdgeTypeFilter implements EntityFilter {
     private List<String> edgeTypes;
 
     public List<String> getEdgeTypes() {
-        if (edgeType != null) {
-            edgeTypes = Collections.singletonList(edgeType);
-        }
-        return edgeTypes;
+        return !CollectionUtils.isEmpty(edgeTypes) ? edgeTypes : Collections.singletonList(edgeType);
     }
 
     @Getter

common/data/src/main/java/org/thingsboard/server/common/data/query/EntityViewTypeFilter.java

@@ -38,10 +38,7 @@ public class EntityViewTypeFilter implements EntityFilter {
     private List<String> entityViewTypes;
 
     public List<String> getEntityViewTypes() {
-        if (entityViewType != null) {
-            entityViewTypes = Collections.singletonList(entityViewType);
-        }
-        return entityViewTypes;
+        return !CollectionUtils.isEmpty(entityViewTypes) ? entityViewTypes : Collections.singletonList(entityViewType);
     }
 
     @Getter