Error of xsd2jsonSchema function when processing xsd without complex types

[mzrt]

Error of xsd2jsonSchema function when processing xsd without complex types.
For example:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
    <xs:element name="TestElemet" type="SomeIdVariation48_Type"></xs:element>
    <xs:simpleType name="SomeIdVariation48_Type">
        <xs:restriction base="xs:string">
            <xs:pattern value="[0-9]{4}" />
        </xs:restriction>
    </xs:simpleType>
</xs:schema>

Expected result:

{
  "properties": {
    "TestElemet": {
      "pattern": "[0-9]{4}",
      "type": "string"
    }
  },
  "type": "object"
}

Actual result:

      TypeError: Cannot read property 'forEach' of undefined
          at getObjType (xsdlib\index.js:580:20)
          at forEach (xsdlib\index.js:682:19)
          at Array.forEach (<anonymous>)
          at renderElements (xsdlib\index.js:668:16)
          at simplifyJson (xsdlib\index.js:695:17)
          at xsd2jsonSchema (xsdlib\index.js:879:15)
          at Object.<anonymous> (xsdlib\__tests__\XsdTest.js:299:16)
          at Object.asyncJestTest (xsdlib\node_modules\jest-jasmine2\build\jasmineAsyncInstall.js:106:37)
          at xsdlib\node_modules\jest-jasmine2\build\queueRunner.js:45:12
          at new Promise (<anonymous>)
          at mapper (xsdlib\node_modules\jest-jasmine2\build\queueRunner.js:28:19)
          at xsdlib\node_modules\jest-jasmine2\build\queueRunner.js:75:41

      at xsd2jsonSchema (index.js:882:13)