strip_package.py should fail if the package was not installed

BUG=chromium:314132
TEST=remote trybots

Change-Id: I0badb73e8ecb5926389daddc72c356cc8d49c42a
Reviewed-on: https://chromium-review.googlesource.com/176268
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Yu-Ju Hong <yjhong@chromium.org>
Tested-by: Yu-Ju Hong <yjhong@chromium.org>
diff --git a/strip_package.py b/strip_package.py
index dcb7f9a..15f90ad 100755
--- a/strip_package.py
+++ b/strip_package.py
@@ -8,6 +8,7 @@
    /build/<board>/stripped-packages."""
 
 import optparse
+import sys
 
 import builder
 
@@ -28,7 +29,9 @@
   if not options.board:
     parser.error('Need to specify --board')
 
-  builder.UpdateGmergeBinhost(options.board, args[0], options.deep)
+  # Check if package was installed.
+  if not builder.UpdateGmergeBinhost(options.board, args[0], options.deep):
+    sys.exit(1)
 
 
 if __name__ == '__main__':