From 128798247cc9d2fb6e838ad330e88c9fc9a2fe6d Mon Sep 17 00:00:00 2001
From: Eugene Yokota <eed3si9n@gmail.com>
Date: Tue, 30 May 2017 00:32:44 -0400
Subject: [PATCH] Guard ManagedChecksums setting retrieval

This setting doesn't exist for ivysettings.xml, which then causes null problem.

Fixes sbt/librarymanagement#110
---
 .../sbt/internal/librarymanagement/ConvertResolver.scala     | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/librarymanagement/src/main/scala/sbt/internal/librarymanagement/ConvertResolver.scala b/librarymanagement/src/main/scala/sbt/internal/librarymanagement/ConvertResolver.scala
index bba247e80..c81bd80a8 100644
--- a/librarymanagement/src/main/scala/sbt/internal/librarymanagement/ConvertResolver.scala
+++ b/librarymanagement/src/main/scala/sbt/internal/librarymanagement/ConvertResolver.scala
@@ -155,7 +155,10 @@ private[sbt] object ConvertResolver {
   /** The default implementation of converter. */
   lazy val defaultConvert: ResolverConverter = {
     case (r, settings, log) =>
-      val managedChecksums = settings.getVariable(ManagedChecksums).toBoolean
+      val managedChecksums = Option(settings.getVariable(ManagedChecksums)) match {
+        case Some(x) => x.toBoolean
+        case _       => false
+      }
       r match {
         case repo: MavenRepository => {
           val pattern = Collections.singletonList(