[incubator-trafficcontrol] 01/02: Added null check. Fixes #1722

[elsloo]

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commit 460bc048b6b46ed836a99f521717e6b157cd480b
Author: Jesse Rivas <jesse_ri...@comcast.com>
AuthorDate: Mon Feb 12 13:45:20 2018 -0700

    Added null check. Fixes #1722
---
 .../cdn/traffic_control/traffic_router/core/hash/ConsistentHasher.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git 
a/traffic_router/core/src/main/java/com/comcast/cdn/traffic_control/traffic_router/core/hash/ConsistentHasher.java
 
b/traffic_router/core/src/main/java/com/comcast/cdn/traffic_control/traffic_router/core/hash/ConsistentHasher.java
index 91cbdb6..099ac7a 100644
--- 
a/traffic_router/core/src/main/java/com/comcast/cdn/traffic_control/traffic_router/core/hash/ConsistentHasher.java
+++ 
b/traffic_router/core/src/main/java/com/comcast/cdn/traffic_control/traffic_router/core/hash/ConsistentHasher.java
@@ -28,7 +28,8 @@ public class ConsistentHasher {
        final private MD5HashFunction hashFunction = new MD5HashFunction();
 
        public <T extends Hashable> T selectHashable(final List<T> hashables, 
final Dispersion dispersion, final String s) {
-               return selectHashables(hashables, dispersion, s).get(0);
+               List<T> selectedHashables = selectHashables(hashables, 
dispersion, s);
+               return !selectedHashables.isEmpty() ? selectedHashables.get(0) 
: null;
        }
 
        public <T extends Hashable> List<T> selectHashables(final List<T> 
hashables, final String s) {

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