Print an error message if git crup doesn't run hooks because of an error

BUG=171501
R=szager@chromium.org


Review URL: https://chromiumcodereview.appspot.com/12040027

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@178357 0039d316-1c4b-4281-b951-d872f2087c98

git-crup

@@ -139,7 +139,15 @@ fi
 
 status=$?
 
-if [ "$hooks" = "yes" -a "$status" -eq 0 ]; then
+if [ "$status" -ne 0 ]; then
+  cat 1>&2 <<EOF
+Please check the preceding terminal output for error messages.
+Run 'git submodule status' to see the current state of submodule checkouts.
+EOF
+  exit $status
+fi
+
+if [ "$hooks" = "yes" ]; then
   "$runhooks"
   status=$?
 fi