Hudson 314, clearcase plugin 0.9

Deleting a branch on a file now causes a build failure in the clearcase plugin. This did not happen with the 0.8.3 plugin that we previously used.

"20090724.090019" "user1" "vobs/proj/com/foo/extractor/Extractor.java" "/main/sne_rxx_i" "destroy sub-branch "proj_rxx_dev" of branch" "rmbranch" ""
Destroyed branch "\main\proj_rxx_i\proj_rxx_dev".

cleartool: Error: activity not found: "".
FATAL: UCM ClearCase failed. exit code=1
FATAL: cleartool did not return the expected exit code. Command line="lsactivity -fmt \"%[headline]p\" \"%[stream]p\" \"%u\" \n ", actual exit code=1
java.io.IOException: cleartool did not return the expected exit code. Command line="lsactivity -fmt \"%[headline]p\" \"%[stream]p\" \"%u\" \n ", actual exit code=1
at hudson.plugins.clearcase.HudsonClearToolLauncher.run(HudsonClearToolLauncher.java:100)
at hudson.plugins.clearcase.ClearToolExec.lsactivity(ClearToolExec.java:109)
at hudson.plugins.clearcase.ucm.UcmHistoryAction.callLsActivity(UcmHistoryAction.java:144)
at hudson.plugins.clearcase.ucm.UcmHistoryAction.buildChangelog(UcmHistoryAction.java:130)
at hudson.plugins.clearcase.history.AbstractHistoryAction.getChanges(AbstractHistoryAction.java:70)
at hudson.plugins.clearcase.AbstractClearCaseScm.checkout(AbstractClearCaseScm.java:296)
at hudson.model.AbstractProject.checkout(AbstractProject.java:830)
at hudson.model.AbstractBuild$AbstractRunner.checkout(AbstractBuild.java:314)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:266)
at hudson.model.Run.run(Run.java:938)
at hudson.model.Build.run(Build.java:112)
at hudson.model.ResourceController.execute(ResourceController.java:93)
at hudson.model.Executor.run(Executor.java:118)