only log into docker when password available

appveyor.yml

@@ -19,7 +19,6 @@ init:
 - ps: Install-Product node $env:nodejs_version
 
 install:
-- sh: echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
 - ps: choco install cloc --no-progress
 - ps: cloc --include-lang TypeScript,JavaScript,HTML,Sass,CSS --vcs git
 - ps: $env:package_version = (Get-Content -Raw -Path package.json | ConvertFrom-Json).version

build-ci.sh

@@ -15,6 +15,11 @@ fi
 echo "Prod deploy: ${PROD_DEPLOY}"
 echo "Tag name: ${TAG_NAME}"
 
+if [ "${DOCKER_USERNAME}" != "" -a "${DOCKER_PASSWORD}" != "" ]
+then
+    echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+fi
+
 chmod +x ./build.sh
 ./build.sh
 ./build.sh tag dev