fix merge config files

Author: thomas-kl1

Model/Config/DocumentType/Converter/FileAllowedExtensionsConverter.php

@@ -8,6 +8,7 @@
 namespace Opengento\Document\Model\Config\DocumentType\Converter;
 
 use DOMNode;
+use function array_filter;
 use function implode;
 use function trim;
 
@@ -21,6 +22,6 @@ public function convert(DOMNode $node): string
             $allowedExtensions[] = trim($childNode->nodeValue);
         }
 
-        return implode(',', $allowedExtensions);
+        return implode(',', array_filter($allowedExtensions));
     }
 }

etc/di.xml

@@ -209,7 +209,7 @@
             <argument name="nodeConverters" xsi:type="array">
                 <item name="default" xsi:type="object">Opengento\Document\Model\Config\DocumentType\Converter\NodeConverter</item>
                 <item name="scheduledImport" xsi:type="object">Opengento\Document\Model\Config\DocumentType\Converter\ScheduledImportConverter</item>
-                <item name="fileAllowedExtensionsComplex" xsi:type="object">Opengento\Document\Model\Config\DocumentType\Converter\FileAllowedExtensionsConverter</item>
+                <item name="fileAllowedExtensions" xsi:type="object">Opengento\Document\Model\Config\DocumentType\Converter\FileAllowedExtensionsConverter</item>
             </argument>
         </arguments>
     </type>
@@ -226,7 +226,7 @@
             <argument name="schemaLocator" xsi:type="object">Opengento\Document\Config\DocumentType\SchemaLocator</argument>
             <argument name="fileName" xsi:type="string">resource_document_types.xml</argument>
             <argument name="idAttributes" xsi:type="array">
-                <item name="config/documentType" xsi:type="string">code</item>
+                <item name="/config/documentType" xsi:type="string">code</item>
             </argument>
         </arguments>
     </virtualType>

etc/resource_document_types.xsd

@@ -36,7 +36,7 @@
     </xs:complexType>
     <xs:complexType name="fileAllowedExtensionsComplex">
         <xs:sequence>
-            <xs:element type="xs:string" name="extension" minOccurs="1" maxOccurs="unbounded"/>
+            <xs:element type="xs:string" name="extension" maxOccurs="unbounded"/>
         </xs:sequence>
     </xs:complexType>
 </xs:schema>