GroupList: handle null pointer when name is null

If PluginConfig.getGroup(GroupReference.extractGroupName(configValue))
[1] is called with configValue without "group" prefix, null will be
passed in to GroupList.byName(name) [2] as name and null pointer will
happen. Changing order of comparison will result in the same
functionality and null pointer avoidance.

[1] https://gerrit.googlesource.com/gerrit/+/refs/heads/master/java/com/google/gerrit/server/config/PluginConfig.java
[2] https://gerrit.googlesource.com/gerrit/+/refs/heads/master/java/com/google/gerrit/server/project/GroupList.java

Change-Id: I0545d7786d71041342651d6bc2ceec96b6fcfd1c
diff --git a/java/com/google/gerrit/server/project/GroupList.java b/java/com/google/gerrit/server/project/GroupList.java
index 7237bb6..9b65413 100644
--- a/java/com/google/gerrit/server/project/GroupList.java
+++ b/java/com/google/gerrit/server/project/GroupList.java
@@ -74,7 +74,7 @@
   public GroupReference byName(String name) {
     return byUUID.entrySet().stream()
         .map(Map.Entry::getValue)
-        .filter(groupReference -> name.equals(groupReference.getName()))
+        .filter(groupReference -> groupReference.getName().equals(name))
         .findAny()
         .orElse(null);
   }