remove empty company arrays on user update

Author: dehora

intercom-java/src/main/java/io/intercom/api/User.java

@@ -78,7 +78,11 @@ static UserUpdate buildFrom(User user) {
             userUpdate.lastSeenIp = user.getLastSeenIp();
             userUpdate.customAttributes = user.getCustomAttributes();
             userUpdate.lastSeenUserAgent = user.getUserAgentData();
-            userUpdate.companyCollection = buildUserUpdateCompanies(user);
+
+            if(! buildUserUpdateCompanies(user).isEmpty()) {
+                userUpdate.companyCollection = buildUserUpdateCompanies(user);
+            }
+
             userUpdate.lastRequestAt = user.getLastRequestAt();
             userUpdate.signedUpAt = user.getSignedUpAt();
             userUpdate.unsubscribedFromEmails = user.getUnsubscribedFromEmails();