Don't fail if the cache file doesn't exist.

Author: bytekeeper

.travis.yml

@@ -15,7 +15,7 @@ before_script:
   - pushd sc-docker
   - python3 setup.py bdist_wheel
   - pip3 install dist/scbw*.whl
-  - '[ -f /tmp/sc-docker/starcraft.zip ] && (cp /tmp/sc-docker/starcraft.zip scbw/local_docker && echo "Using cached starcraft.zip")'
+  - '[ ! -f /tmp/sc-docker/starcraft.zip ] || (cp /tmp/sc-docker/starcraft.zip scbw/local_docker && echo "Using cached starcraft.zip")'
   - cd docker
   - ./build_images.sh
   - popd