fix(chat): allow file-only messages with no text to be sent in chat p… #4838

Job	Run time
Test and Build / Test and Build	1m 51s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	5m 2s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	1m 55s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	46s
Build ARM64 (GHCR Only)	0s
Process Docs / Process Documentation Embeddings	4m 45s
Deploy Trigger.dev / Deploy to Trigger.dev	1m 12s
Create GHCR Manifests	0s
	15m 31s

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