always display the enter credential link regardless of the error code, given that some users reported the following error:
ERROR: Error in subversion
org.tmatesoft.svn.core.SVNCancelException: svn: authentication cancelled
	at org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:44)
	at org.tmatesoft.svn.core.internal.io.dav.DAVUtil.findStartingProperties(DAVUtil.java:124)
	at org.tmatesoft.svn.core.internal.io.dav.DAVUtil.getBaselineProperties(DAVUtil.java:197)
	at org.tmatesoft.svn.core.internal.io.dav.DAVUtil.getBaselineInfo(DAVUtil.java:160)
	at org.tmatesoft.svn.core.internal.io.dav.DAVRepository.getLatestRevision(DAVRepository.java:147)
	at org.tmatesoft.svn.core.wc.SVNBasicClient.getRevisionNumber(SVNBasicClient.java:337)
	at org.tmatesoft.svn.core.wc.SVNUpdateClient.doUpdate(SVNUpdateClient.java:159)
	at hudson.scm.SubversionSCM$3.invoke(SubversionSCM.java:378)
	at hudson.scm.SubversionSCM$3.invoke(SubversionSCM.java:368)
	at hudson.FilePath.act(FilePath.java:191)
	at hudson.scm.SubversionSCM.update(SubversionSCM.java:368)
	at hudson.scm.SubversionSCM.checkout(SubversionSCM.java:223)
	at hudson.model.AbstractProject.checkout(AbstractProject.java:255)
	at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:101)
	at hudson.model.Run.run(Run.java:533)
	at hudson.model.Build.run(Build.java:266)
	at hudson.model.Executor.run(Executor.java:61)


git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@1793 71c3de6d-444a-0410-be80-ed276b4c234a