Fix panic when watch rebuilds without up

[maxproske]

What I did

nil-check for when watch --no-up skips initializing the progress tty, but rebuild sends events to it

Steps to reproduce:

cat > compose.yaml <<'EOF'
services:
  test:
    build:
      dockerfile_inline: "FROM alpine"
    develop:
      watch:
        - action: rebuild
          path: ./trigger.txt
EOF

docker compose up --build -d
docker compose watch --no-up &
sleep 1
touch trigger.txt
# Rebuilding service(s) ["test"] after changes were detected...
# panic: runtime error: invalid memory address or nil pointer dereference

Related issue

Closes #13609

[codecov]

Codecov Report

❌ Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cmd/display/tty.go	0.00%	9 Missing ⚠️

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