fix: add default empty array value for null policy profiles

docs/migration/Version_0.7.x_0.8.x.md

@@ -38,6 +38,9 @@ For those who are not using either the Helm Charts or the provided [`migration`
 - [federated catalog - init schema](../../edc-extensions/migrations/control-plane-migration/src/main/resources/org/eclipse/tractusx/edc/postgresql/migration/federatedcatalog/V0_0_1__Init_FederatedCatalogCache_Database_Schema.sql)
 - [policy monitor - create state index](../../edc-extensions/migrations/control-plane-migration/src/main/resources/org/eclipse/tractusx/edc/postgresql/migration/policy-monitor/V0_0_2__Alter_PolicyMonitor_CreateStateIndex.sql)
 - [policy definition - add profiles column](../../edc-extensions/migrations/control-plane-migration/src/main/resources/org/eclipse/tractusx/edc/postgresql/migration/policy/V0_0_5__Add_Profiles.sql)
+  - **WARNING**: in version 0.8.0 this could give runtime errors, eventually you can manually run the query contained in the 
+    [subsequent migration](../../edc-extensions/migrations/control-plane-migration/src/main/resources/org/eclipse/tractusx/edc/postgresql/migration/policy/V0_0_6__Avoid_null_profiles.sql).
+    The migration fix will be available from 0.8.1 on.  
 - [transfer process - create state index](../../edc-extensions/migrations/control-plane-migration/src/main/resources/org/eclipse/tractusx/edc/postgresql/migration/transferprocess/V0_0_16__Alter_TransferProcess_CreateStateIndex.sql)
 
 ### 2.2. Data plane:
@@ -99,4 +102,4 @@ of the helm charts in error.
 -java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter
 -java.util.logging.ConsoleHandler.level=ALL
 -java.util.logging.SimpleFormatter.format=[%1$tY-%1$tm-%1$td %1$tH:%1$tM:%1$tS] [%4$-7s] %5$s%6$s%n
-```
+```

edc-extensions/migrations/control-plane-migration/src/main/resources/org/eclipse/tractusx/edc/postgresql/migration/policy/V0_0_6__Avoid_null_profiles.sql

@@ -0,0 +1,14 @@
+--
+--  Copyright (c) 2024 Contributors to the Eclipse Foundation
+--
+--  This program and the accompanying materials are made available under the
+--  terms of the Apache License, Version 2.0 which is available at
+--  https://www.apache.org/licenses/LICENSE-2.0
+--
+--  SPDX-License-Identifier: Apache-2.0
+--
+--  Contributors:
+--       Contributors to the Eclipse Foundation - initial API and implementation
+--
+
+UPDATE edc_policydefinitions SET profiles='[]'::json where profiles is NULL;