vcs: don't open Messages toolwindow to show commit message error

it is already shown in the notification

platform/vcs-impl/src/com/intellij/openapi/vcs/changes/ui/CommitHelper.java

@@ -272,8 +272,6 @@ public class CommitHelper {
       }
 
       processor.doBeforeRefresh();
-
-      AbstractVcsHelper.getInstance(myProject).showErrors(processor.getVcsExceptions(), myActionName);
     }
     catch (ProcessCanceledException pce) {
       throw pce;