deploy: exit gracefully if there is nothing to commit

Author: jaxxzer

ci/deploy.sh

@@ -28,7 +28,7 @@ if [ "${TRAVIS}" == "true" ]; then
   test git config user.name "BlueRobotics-CI"
 fi
 
-test git commit -m "update autogenerated files for $(git rev-parse HEAD@{2})"
+git commit -m "update autogenerated files for $(git rev-parse HEAD@{2})" || return 0
 
 # deploy
 if [ ! -z ${TRAVIS_PULL_REQUEST} ] && [ ${TRAVIS_PULL_REQUEST} == "false" ]; then