ant -p swallows (configuration) errors silently.

PR:  27732


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276246 13f79535-47bb-0310-9956-ffa450edef68

WHATSNEW

@@ -87,6 +87,9 @@ Fixed bugs:
 * <java> swallowed the stack trace of exceptions thrown by the
   executed program if run in the same VM.
 
+* -projecthelp swallowed (configuration) errors silently.
+  Bugzilla report 27732.
+
 Other changes:
 --------------
 

src/main/org/apache/tools/ant/Main.java

@@ -685,6 +685,8 @@ public class Main implements AntMain {
         } finally {
             if (!projectHelp) {
                 project.fireBuildFinished(error);
+            } else if (error != null) {
+                project.log(error.toString(), Project.MSG_ERR);
             }
         }
     }