fixed an NPE from Jelly below:

java.lang.NullPointerException
        at org.apache.commons.jexl.parser.ASTAddNode.value(ASTAddNode.java:116)
        at org.apache.commons.jexl.parser.ASTExpression.value(ASTExpression.java:53)
        at org.apache.commons.jexl.parser.ASTMethod.execute(ASTMethod.java:81)
        at org.apache.commons.jexl.parser.ASTReference.execute(ASTReference.java:82)
        at org.apache.commons.jexl.parser.ASTReference.value(ASTReference.java:56)
        at org.apache.commons.jexl.parser.ASTReferenceExpression.value(ASTReferenceExpression.java:50)
        at org.apache.commons.jexl.ExpressionImpl.evaluate(ExpressionImpl.java:79)
        at org.apache.commons.jelly.expression.jexl.JexlExpression.evaluate(JexlExpression.java:69)
        at org.apache.commons.jelly.tags.core.SetTag.doTag(SetTag.java:84)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
        at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
        at org.apache.commons.jelly.impl.DynamicTag.doTag(DynamicTag.java:80)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
        at org.apache.commons.jelly.tags.core.WhenTag.doTag(WhenTag.java:46)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
        at org.apache.commons.jelly.tags.core.ChooseTag.doTag(ChooseTag.java:38)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
        at org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:150)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
        at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
        at org.apache.commons.jelly.impl.DynamicTag.doTag(DynamicTag.java:80)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
        at org.apache.commons.jelly.tags.core.OtherwiseTag.doTag(OtherwiseTag.java:41)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
        at org.apache.commons.jelly.tags.core.ChooseTag.doTag(ChooseTag.java:38)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
        at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
        at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
        at org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:150)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
        at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
        at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
        at org.apache.commons.jelly.tags.core.IfTag.doTag(IfTag.java:42)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)


git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@1801 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/Functions.java

@@ -296,4 +296,9 @@ public class Functions {
         }
         return null;
     }
+
+    public static String appendSpaceIfNotNull(String n) {
+        if(n==null) return null;
+        else        return n+' ';
+    }
 }

core/src/main/resources/lib/hudson/buildLink.jelly

@@ -6,7 +6,7 @@
 	<%@ attribute name="number" type="java.lang.Integer" required="true" %>
 -->
 <j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
-  <j:set var="jobName_" value="${h.ifThenElse(jobName!=null,jobName+' ',null)}"/>
+  <j:set var="jobName_" value="${h.appendSpaceIfNotNull(jobName)}"/>
   <j:choose>
 	  <j:when test="${job==null}">
 	    ${jobName_}#<!-- -->${number}