site: Allow empty commits.

test-runner.sh

@@ -19,7 +19,7 @@ then
 	git add -f .
 	git config user.email 'travis@rdrei.net'
 	git config user.name 'TasteBot'
-	git commit -am 'update the build files for gh-pages [ci skip]'
+	git commit --allow-empty -am 'update the build files for gh-pages [ci skip]'
 	# Any command that using GH_OAUTH_TOKEN must pipe the output to /dev/null to not expose your oauth token
 	git push https://${GH_OAUTH_TOKEN}@github.com/${GH_OWNER}/${GH_PROJECT_NAME} HEAD:gh-pages > /dev/null 2>&1
 else