diff --git a/hail/src/main/scala/is/hail/backend/api/Py4JBackendApi.scala b/hail/src/main/scala/is/hail/backend/api/Py4JBackendApi.scala
index 3e695dac9181..216d55154a18 100644
--- a/hail/src/main/scala/is/hail/backend/api/Py4JBackendApi.scala
+++ b/hail/src/main/scala/is/hail/backend/api/Py4JBackendApi.scala
@@ -38,6 +38,7 @@ import org.json4s.jackson.{JsonMethods, Serialization}
 import sourcecode.Enclosing
 
 import javax.annotation.Nullable
+import scala.annotation.nowarn
 
 final class Py4JBackendApi(backend: Backend) extends Closeable with ErrorHandling {
 
@@ -92,9 +93,14 @@ final class Py4JBackendApi(backend: Backend) extends Closeable with ErrorHandlin
     val cloudfsConf = CloudStorageFSConfig.fromFlagsAndEnv(None, flags)
 
     val rpConfig: Option[RequesterPaysConfig] =
-      (Option(project).filter(_.nonEmpty), Option(buckets)) match {
-        case (Some(project), buckets) => Some(RequesterPaysConfig(project, buckets.map(_.asScala.toSet)))
-        case (None, Some(_)) => fatal("A non-empty, non-null requester pays google project is required to configure requester pays buckets.")
+      (
+        Option(project).filter(_.nonEmpty),
+        Option(buckets).map(_.asScala.toSet.filterNot(_.isBlank)).filter(_.nonEmpty),
+      ) match {
+        case (Some(project), buckets) => Some(RequesterPaysConfig(project, buckets))
+        case (None, Some(_)) => fatal(
+            "A non-empty, non-null requester pays google project is required to configure requester pays buckets."
+          )
         case (None, None) => None
       }
 
@@ -115,7 +121,9 @@ final class Py4JBackendApi(backend: Backend) extends Closeable with ErrorHandlin
     persistedIr.remove(id)
 
   def pyAddSequence(name: String, fastaFile: String, indexFile: String): Unit =
-    references(name).addSequence(IndexedFastaSequenceFile(tmpFileManager.getFs, fastaFile, indexFile))
+    references(name).addSequence(
+      IndexedFastaSequenceFile(tmpFileManager.getFs, fastaFile, indexFile)
+    )
 
   def pyRemoveSequence(name: String): Unit =
     references(name).removeSequence()
@@ -440,7 +448,7 @@ final class Py4JBackendApi(backend: Backend) extends Closeable with ErrorHandlin
         t
       }
 
-      def port: Int = httpServer.getAddress.getPort
+      @nowarn def port: Int = httpServer.getAddress.getPort
       override def close(): Unit = httpServer.stop(10)
 
       thread.start()
diff --git a/hail/src/main/scala/is/hail/utils/package.scala b/hail/src/main/scala/is/hail/utils/package.scala
index 05d1d0932b45..4fc2acbaf268 100644
--- a/hail/src/main/scala/is/hail/utils/package.scala
+++ b/hail/src/main/scala/is/hail/utils/package.scala
@@ -91,6 +91,24 @@ package utils {
       b.result()
     }
   }
+
+
+  class Lazy[A] private[utils] (f: => A) {
+    private[this] var option: Option[A] = None
+
+    def apply(): A =
+      synchronized {
+        option match {
+          case Some(a) => a
+          case None => val a = f; option = Some(a); a
+        }
+      }
+
+    def isEvaluated: Boolean =
+      synchronized {
+        option.isDefined
+      }
+  }
 }
 
 package object utils
@@ -1058,23 +1076,6 @@ package object utils
 
   implicit def evalLazy[A](f: Lazy[A]): A =
     f()
-
-  class Lazy[A] private[utils] (f: => A) {
-    private[this] var option: Option[A] = None
-
-    def apply(): A =
-      synchronized {
-        option match {
-          case Some(a) => a
-          case None => val a = f; option = Some(a); a
-        }
-      }
-
-    def isEvaluated: Boolean =
-      synchronized {
-        option.isDefined
-      }
-  }
 }
 
 class CancellingExecutorService(delegate: ExecutorService) extends AbstractExecutorService {