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work even if ENV variable unset
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@ -2,6 +2,8 @@
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set -e -u
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GCM_SENDER_ID=${GCM_SENDER_ID:-""}
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if [ -z "$GCM_SENDER_ID" ]; then
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echo "GCM_SENDER_ID empty; GCM use will be disabled" >&2
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fi
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