UpdateChecker: Remove uneeded Strings.nullToEmpty

At this place input.description can never be null.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I7de3eda9ea3e8a1232e646bddcca07e082c0239d
diff --git a/java/com/google/gerrit/plugins/checks/api/UpdateChecker.java b/java/com/google/gerrit/plugins/checks/api/UpdateChecker.java
index 9c3158b..1892351 100644
--- a/java/com/google/gerrit/plugins/checks/api/UpdateChecker.java
+++ b/java/com/google/gerrit/plugins/checks/api/UpdateChecker.java
@@ -14,7 +14,6 @@
 
 package com.google.gerrit.plugins.checks.api;
 
-import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableSortedSet;
 import com.google.gerrit.extensions.restapi.BadRequestException;
 import com.google.gerrit.extensions.restapi.RestApiException;
@@ -92,7 +91,7 @@
     }
 
     if (input.description != null) {
-      checkerUpdateBuilder.setDescription(Strings.nullToEmpty(input.description).trim());
+      checkerUpdateBuilder.setDescription(input.description.trim());
     }
 
     if (input.url != null) {