status: tell the user the working tree is clean

If there is nothing output at all, tell the user the working tree is
completely clean.  It just gives them a bit more of a warm-fuzzy
feeling knowing repo and until the end.  It also more closely
matches with the output of git status.

Signed-off-by: Shawn O. Pearce <sop@google.com>

subcmds/status.py

@@ -23,5 +23,12 @@ class Status(PagedCommand):
 """
 
   def Execute(self, opt, args):
-    for project in self.GetProjects(args):
-      project.PrintWorkTreeStatus()
+    all = self.GetProjects(args)
+    clean = 0
+
+    for project in all:
+      state = project.PrintWorkTreeStatus()
+      if state == 'CLEAN':
+        clean += 1
+    if len(all) == clean:
+      print 'nothing to commit (working directory clean)'