Keywords: disable delete grant when a keyword is essential

entity/KeywordEntry_entity/KeywordEntry_entity.aod

@@ -5,6 +5,8 @@
   <documentation>%aditoprj%/entity/KeywordEntry_entity/documentation.adoc</documentation>
   <title>Keyword</title>
   <siblings />
+  <grantDelete v="false" />
+  <grantDeleteProcess>%aditoprj%/entity/KeywordEntry_entity/grantDeleteProcess.js</grantDeleteProcess>
   <contentTitleProcess>%aditoprj%/entity/KeywordEntry_entity/contentTitleProcess.js</contentTitleProcess>
   <onValidation>%aditoprj%/entity/KeywordEntry_entity/onValidation.js</onValidation>
   <iconId>VAADIN:KEY</iconId>

entity/KeywordEntry_entity/grantDeleteProcess.js

+import("system.result");
+import("system.vars");
+
+var isEssential = vars.get("$field.ISESSENTIAL");
+
+var granted = true;
+if (isEssential == "1")
+    granted = false;
+    
+result.string(granted)
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