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functions: fix unbound variable
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@ -640,7 +640,7 @@ snap_preseed() {
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# Seed from the specified channel (e.g. core18 latest/stable)
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# Or Channel endcoded in the snap name (e.g. lxd=4.0/stable/ubuntu-20.04)
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# Or Ubuntu policy default channel latest/stable/ubuntu-$(release_ver)
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local CHANNEL=$3
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local CHANNEL=${3:-}
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if [ -z "$CHANNEL" ]; then
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case $2 in
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*=*)
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