autoninja: only checks cr_build_revision when reclient_cfgs is deployed via cipd

non-Googlers may use own reclient_cfgs, which may not have
cr_build_revision marker.
Don't check cr_build_revision if reclient_cfgs is not deployed
by cipd.

Change-Id: I1be1f88c47abb2ab192222e3c7bcebbb37ee3f79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/7019373
Auto-Submit: Fumitoshi Ukai <ukai@google.com>
Reviewed-by: Junji Watanabe <jwata@google.com>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Fumitoshi Ukai <ukai@google.com>

autoninja.py

@@ -255,6 +255,12 @@ def _check_reclient_cfgs(output_dir):
     root_dir = gclient_paths.GetPrimarySolutionPath(output_dir)
     if not root_dir:
         return
+    if not os.path.exists(
+            os.path.join(
+                root_dir,
+                "buildtools/reclient_cfgs/chromium-browser-clang/.cipd")):
+        # reclient cfgs is not deployed by cipd
+        return
     cr_build_revision_path = os.path.join(
         root_dir, "third_party/llvm-build/Release+Asserts/cr_build_revision")
     cr_build_revision = None