Prevent crash on persons & relations without names.

src/main/kotlin/builders/AgentContainerBuilder.kt

@@ -19,10 +19,12 @@
 package org.memobase.builders
 
 import com.beust.klaxon.JsonObject
+import org.apache.logging.log4j.LogManager
 import org.memobase.KEYS
 import org.memobase.helpers.Extract
 import org.memobase.helpers.FacetBuildHelpers
 import org.memobase.model.AgentWithRelationContainer
+import org.memobase.model.LanguageContainer
 import org.memobase.rdf.NS
 
 class AgentContainerBuilder(
@@ -31,7 +33,7 @@ class AgentContainerBuilder(
     private val creationRelationType: String?,
     private val inputMap: Map<String, JsonObject>
 ) : IFieldBuilder {
-
+    private val log = LogManager.getLogger("AgentContainerBuilder")
     private val containers = mutableListOf<AgentWithRelationContainer>()
 
     override fun filter(jsonObject: JsonObject): Boolean {
@@ -51,15 +53,24 @@ class AgentContainerBuilder(
     }
 
     override fun append(jsonObject: JsonObject): String {
-        val name = Extract.languageContainer("agent-name", jsonObject[KEYS.name])
-            .reduce { acc, languageContainer -> acc.merge(languageContainer) }
+        val names = Extract.languageContainer("agent-name", jsonObject[KEYS.name])
+        val name = if (names.isNotEmpty())
+                names.reduce { acc, languageContainer -> acc.merge(languageContainer) }
+        else
+            LanguageContainer(emptyList(), emptyList(), emptyList(), listOf("NoNameFound"))
+        log.warn("Creation relation without names in agent ${jsonObject["@id"]}")
         val relation = if (jsonObject.containsKey(KEYS.agentIsTargetOfCreationRelation)) {
             val creationRelation = inputMap[jsonObject[KEYS.agentIsTargetOfCreationRelation]]
             creationRelation.let {
-                if (it != null)
-                    Extract.languageContainer("creation-relation-name", it["name"])
-                        .reduce { acc, languageContainer -> acc.merge(languageContainer) }
-                else
+                if (it != null) {
+                    val languages = Extract.languageContainer("creation-relation-name", it["name"])
+                    if (languages.isNotEmpty())
+                        languages.reduce { acc, languageContainer -> acc.merge(languageContainer) }
+                    else {
+                        log.warn("Creation relation without names in agent ${jsonObject["@id"]}")
+                        LanguageContainer(emptyList(), emptyList(), emptyList(), emptyList())
+                    }
+                } else
                     null
             }
         } else {