title: Jenkins Multibranch Pipeline Indexing Issue
body: <p>Good day,</p>
  
  <p>I am trying to setup a Multibranch pipeline on our new Jenkins instance and I encountered this error in the <em>Scan Multibranch Pipeline Log</em>:</p>
  
  <p><strong>No such file: E:\Continuous Integration\Jenkins\jobs\Enhanced-API\indexing\indexing.log</strong></p>
  
  <p>According to jenkins.err.log, I encountered a</p>
  
  <p><code>WARNING: Caught exception evaluating: h.filterDescriptors(it,attrs.descriptors) in /view/EAPI/job/Enhanced-API/configure. Reason: java.lang.NullPointerException: Descriptor list is null for context 'class org.jenkinsci.plugins.workflow.multibranch.WorkflowMultiBranchProject' in thread 'Handling GET /view/EAPI/job/Enhanced-API/configure from 10.117.100.110 : RequestHandlerThread[#35] AbstractFolder/configure.jelly FolderLibraries/DescriptorImpl/config.jelly LibraryConfiguration/config.jelly SCMRetriever/DescriptorImpl/config.jelly MultiSCM/DescriptorImpl/config.jelly'
  java.lang.NullPointerException: Descriptor list is null for context 'class org.jenkinsci.plugins.workflow.multibranch.WorkflowMultiBranchProject' in thread 'Handling GET /view/EAPI/job/Enhanced-API/configure from 10.117.100.110 : RequestHandlerThread[#35] AbstractFolder/configure.jelly FolderLibraries/DescriptorImpl/config.jelly LibraryConfiguration/config.jelly SCMRetriever/DescriptorImpl/config.jelly MultiSCM/DescriptorImpl/config.jelly'
      at hudson.model.DescriptorVisibilityFilter.apply(DescriptorVisibilityFilter.java:73)
      at hudson.Functions.filterDescriptors(Functions.java:1863)
      at sun.reflect.GeneratedMethodAccessor293.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      at java.lang.reflect.Method.invoke(Unknown Source)
      at org.apache.commons.jexl.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:258)
      at org.apache.commons.jexl.parser.ASTMethod.execute(ASTMethod.java:104)
      at org.apache.commons.jexl.parser.ASTReference.execute(ASTReference.java:83)
      at org.apache.commons.jexl.parser.ASTReference.value(ASTReference.java:57)
      at org.apache.commons.jexl.parser.ASTReferenceExpression.value(ASTReferenceExpression.java:51)
      at org.apache.commons.jexl.ExpressionImpl.evaluate(ExpressionImpl.java:80)
      at hudson.ExpressionFactory2$JexlExpression.evaluate(ExpressionFactory2.java:74)
      at org.apache.commons.jelly.tags.core.CoreTagLibrary$3.run(CoreTagLibrary.java:134)
      at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
      at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)
  </code></p>
  
  <p>The version of this Jenkins is <strong>2.85</strong> with the following versions of Git plugin:</p>
  
  <p>Git client plugin - 2.5.0</p>
  
  <p>Git plugin - 3.6.0</p>
  
  <p>GIT server Plugin - 1.7</p>
  
  <p>GitHub API Plugin - 1.89</p>
  
  <p>GitHub Branch Source Plugin - 2.2.3</p>
  
  <p>GitHub plugin - 1.28.0</p>
  
  <p>Any idea on why did we encounter this issue? Thanks!</p>