EC2 image architecture can be null. Don't throw NPE if architecture is null.
diff --git a/apis/ec2/src/main/java/org/jclouds/ec2/domain/Image.java b/apis/ec2/src/main/java/org/jclouds/ec2/domain/Image.java
index 12a95d1..c3e8592 100644
--- a/apis/ec2/src/main/java/org/jclouds/ec2/domain/Image.java
+++ b/apis/ec2/src/main/java/org/jclouds/ec2/domain/Image.java
@@ -78,7 +78,7 @@
@Nullable String ramdiskId, RootDeviceType rootDeviceType, @Nullable String rootDeviceName,
Map<String, EbsBlockDevice> ebsBlockDevices, VirtualizationType virtualizationType, Hypervisor hypervisor) {
this.region = checkNotNull(region, "region");
- this.architecture = checkNotNull(architecture, "architecture");
+ this.architecture = architecture;
this.imageId = checkNotNull(imageId, "imageId");
this.name = name;
this.description = description;