If an invalid ref is provided in the user input we should rather fail
with '400 Bad Request' and provide an error message to the user.
Error in PUT /projects/All-Projects/access:review
com.google.gerrit.common.errors.InvalidNameException: Invalid Name: refs/heads/stable_*
at com.google.gerrit.server.project.RefPattern.validate(RefPattern.java:93)
at com.google.gerrit.server.restapi.project.SetAccessUtil.validateChanges(SetAccessUtil.java:152)
at com.google.gerrit.server.restapi.project.CreateAccessChange.apply(CreateAccessChange.java:124)
at com.google.gerrit.server.restapi.project.CreateAccessChange.apply(CreateAccessChange.java:60)
at com.google.gerrit.httpd.restapi.RestApiServlet.service(RestApiServlet.java:418)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
...
Change-Id: I40053f0736f3f43281059da40f27d550eec68626
Signed-off-by: Edwin Kempin <ekempin@google.com>