forall: Silently skip missing projects

If a project is missing locally, it might be OK to skip over it
and continue running the same command in other projects.

Bug: REPO-43
Change-Id: I64f97eb315f379ab2c51fc53d24ed340b3d09250
Signed-off-by: Shawn O. Pearce <sop@google.com>
(cherry picked from commit d4cd69bdef)

subcmds/forall.py

@@ -169,6 +169,12 @@ terminal and are not redirected.
       else:
         cwd = project.worktree
 
+      if not os.path.exists(cwd):
+        if (opt.project_header and opt.verbose) \
+        or not opt.project_header:
+          print >>sys.stderr, 'skipping %s/' % project.relpath
+        continue
+
       if opt.project_header:
         stdin = subprocess.PIPE
         stdout = subprocess.PIPE