fix compilation error of previous commit

Project: http://git-wip-us.apache.org/repos/asf/incubator-wave/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-wave/commit/a1b0c42b
Tree: http://git-wip-us.apache.org/repos/asf/incubator-wave/tree/a1b0c42b
Diff: http://git-wip-us.apache.org/repos/asf/incubator-wave/diff/a1b0c42b

Branch: refs/heads/swellrt
Commit: a1b0c42b01c5407c508a8418ac38eba3519f9892
Parents: 44d123b
Author: Antonio Tenorio Fornés <[email protected]>
Authored: Tue Oct 4 17:17:18 2016 +0200
Committer: Antonio Tenorio Fornés <[email protected]>
Committed: Tue Oct 4 17:17:18 2016 +0200

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 wave/build.gradle                                                  | 2 +-
 .../java/org/swellrt/server/box/servlet/JoinMessageService.java    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
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http://git-wip-us.apache.org/repos/asf/incubator-wave/blob/a1b0c42b/wave/build.gradle
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diff --git a/wave/build.gradle b/wave/build.gradle
index fe3fa10..a9b3e28 100644
--- a/wave/build.gradle
+++ b/wave/build.gradle
@@ -30,7 +30,7 @@ apply plugin: 'com.google.protobuf'
 /* Meta Data Info */
 def title = 'SwellRT'
 def vendor = 'SwellRT Community'
-version = "0.54.3-alpha"
+version = "0.54.4-alpha"
 archivesBaseName = "swellrt"
 def distFolder = "swellrt"
 mainClassName = "org.waveprotocol.box.server.ServerMain"

http://git-wip-us.apache.org/repos/asf/incubator-wave/blob/a1b0c42b/wave/src/main/java/org/swellrt/server/box/servlet/JoinMessageService.java
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diff --git 
a/wave/src/main/java/org/swellrt/server/box/servlet/JoinMessageService.java 
b/wave/src/main/java/org/swellrt/server/box/servlet/JoinMessageService.java
index 2003244..c2498a0 100644
--- a/wave/src/main/java/org/swellrt/server/box/servlet/JoinMessageService.java
+++ b/wave/src/main/java/org/swellrt/server/box/servlet/JoinMessageService.java
@@ -130,7 +130,7 @@ public class JoinMessageService extends BaseService {
 
       String subject;
 
-      if (participantId != null && !acc.getId().isAnonymous()){
+      if (participantId != null && hum != null && !hum.getId().isAnonymous()) {
         String inviter = participantId.getAddress().split("@")[0];
         subject = MessageFormat.format(b.getString("joinNamedEmailSubject"), 
inviter, urlText);
       } else {

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