[FIXED JENKINS-10799] very early on during the boot sequence, NPE can

happen.

This happens because the version number isn't computed yet, but we try
to put that into HTTP header.

Fixing this by making <st:header/> tolerate null in value or name.

changelog.html

@@ -67,6 +67,9 @@ Upcoming changes</a>
   <li class=bug>
     Jenkins didn't start on IBM JDK.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-10810">issue 10810</a>)
+  <li class=bug>
+    Fixed a possible NPE during the boot sequence
+    (<a href="https://issues.jenkins-ci.org/browse/JENKINS-10799">issue 10799</a>)
   <li class=rfe>
     stdin/stdout based remote slaves, such as ones launched via SSH or script, now does a better redirect to avoid interference with JVM output to stdout.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-8856">issue 8856</a>)

core/pom.xml

@@ -42,7 +42,7 @@ THE SOFTWARE.
 
   <properties>
     <staplerFork>true</staplerFork>
-    <stapler.version>1.172</stapler.version>
+    <stapler.version>1.173</stapler.version>
   </properties>
 
   <dependencies>