ConfigInfo: Annotate MaxObjectSizeLimitInfo fields as nullable

Change-Id: If2051c9d47a0c93255a3fd8df7d0b99c502bc8d8
diff --git a/gerrit-extension-api/src/main/java/com/google/gerrit/extensions/api/projects/ConfigInfo.java b/gerrit-extension-api/src/main/java/com/google/gerrit/extensions/api/projects/ConfigInfo.java
index c3e9b44..09ad328 100644
--- a/gerrit-extension-api/src/main/java/com/google/gerrit/extensions/api/projects/ConfigInfo.java
+++ b/gerrit-extension-api/src/main/java/com/google/gerrit/extensions/api/projects/ConfigInfo.java
@@ -14,6 +14,7 @@
 
 package com.google.gerrit.extensions.api.projects;
 
+import com.google.gerrit.common.Nullable;
 import com.google.gerrit.extensions.client.InheritableBoolean;
 import com.google.gerrit.extensions.client.ProjectState;
 import com.google.gerrit.extensions.client.SubmitType;
@@ -47,14 +48,14 @@
   }
 
   public static class MaxObjectSizeLimitInfo {
-    /* The effective value. */
-    public String value;
+    /* The effective value. Null if not set. */
+    @Nullable public String value;
 
-    /* The value configured on the project. */
-    public String configuredValue;
+    /* The value configured on the project. Null if not set. */
+    @Nullable public String configuredValue;
 
-    /* The value configured globally. */
-    public String inheritedValue;
+    /* The value configured globally. Null if not set. */
+    @Nullable public String inheritedValue;
   }
 
   public static class ConfigParameterInfo {