Do not run openssl if TRAVIS_PULL_REQUEST is set

Author: mmasdeu

.travis.yml

@@ -23,5 +23,4 @@ before_cache:
 after_success:
 - "./.travis-deploy-doc.sh"
 before_script:
-- openssl aes-256-cbc -K $encrypted_2f33c728c8dc_key -iv $encrypted_2f33c728c8dc_iv
-  -in .travis_ci_gh_pages_deploy_key.enc -out .travis_ci_gh_pages_deploy_key -d
+- 'if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then openssl aes-256-cbc -K $encrypted_2f33c728c8dc_key -iv $encrypted_2f33c728c8dc_iv -in .travis_ci_gh_pages_deploy_key.enc -out .travis_ci_gh_pages_deploy_key -d; fi'