Don't set note_db_enabled in ServerInfo if false

In the REST API we always return null for boolean values that are
false.

Change-Id: Idce6acc1a1ae7f81b49b8f2d2a9d49f368800088
Signed-off-by: Edwin Kempin <ekempin@google.com>

Documentation/rest-api-config.txt

diff --git a/Documentation/rest-api-config.txt b/Documentation/rest-api-config.txt
index 5987e1d..7341894 100644
--- a/Documentation/rest-api-config.txt
+++ b/Documentation/rest-api-config.txt
@@ -1416,7 +1416,7 @@
 Information about the configuration from the
 link:config-gerrit.html#gerrit[gerrit] section as link:#gerrit-info[
 GerritInfo] entity.
-|`note_db_enabled`         ||
+|`note_db_enabled`         |not set if `false`|
 Whether the NoteDB storage backend is fully enabled.
 |`plugin `                 ||
 Information about Gerrit extensions by plugins as

gerrit-server/src/main/java/com/google/gerrit/server/config/GetServerInfo.java

diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/config/GetServerInfo.java b/gerrit-server/src/main/java/com/google/gerrit/server/config/GetServerInfo.java
index af2d410..2b621c2 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/config/GetServerInfo.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/config/GetServerInfo.java
@@ -114,7 +114,7 @@
         getDownloadInfo(downloadSchemes, downloadCommands, cloneCommands,
             archiveFormats);
     info.gerrit = getGerritInfo(config, allProjectsName, allUsersName);
-    info.noteDbEnabled = isNoteDbEnabled();
+    info.noteDbEnabled = toBoolean(isNoteDbEnabled());
     info.plugin = getPluginInfo();
     info.sshd = getSshdInfo(config);
     info.suggest = getSuggestInfo(config);