editor: surface the disabled-built-in-pipeline state instead of hiding it

'No, I'll use my own pipeline' in the missing-nodes prompt silently
PERSISTED disable_core on the project. From then on Engine settings…
greyed out with no reason and Generate died with ComfyUI's raw
"Prompt has no outputs" - both looked like breakage with no visible cause.

- The setup prompt button now confirms first, spelling out what it
  disables, what Generate will need, and where to re-enable it.
- Engine settings… never greys over pipeline state anymore: the modal
  itself already explains why knobs are unavailable and links to Models.
- Builder: disable_core with NO output node in the graph is now a
  BLOCKING error with the fix in the message (wire 🌐 Global video
  output, or Models → Enable built-in pipeline) instead of letting
  ComfyUI reject the queue.
- GEN_ERROR_MAP: prompt_no_outputs mapped to the same actionable text
  for custom pipelines that pass the builder but lack an output node.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

movie_editor/backend/builder.py

@@ -547,11 +547,23 @@ def build(object_info: dict, models_config: dict, params: dict, media: dict | No
         report["unsatisfied"].append(msg)
 
     # With the built-in pipeline disabled, the result must come from the global outputs (or a
-    # save node the user wired). Warn (non-blocking) if nothing will surface to the editor.
+    # save node the user wired). If NO output node exists at all this is BLOCKING: ComfyUI
+    # would reject the queue with a raw "Prompt has no outputs" — surface the real cause and
+    # the fix instead. If some output-capable node exists, keep it a non-blocking warning
+    # (the editor may still not see the result, but the run itself is valid).
     if disable_core and "global_out" not in graph:
-        report["unsatisfied"].append(
-            "Built-in pipeline is disabled and nothing is wired to the Global video output — "
-            "the editor may not show a result. Wire a final IMAGE output to 🌐 Global video output.")
+        has_output_node = any(
+            (object_info.get(n.get("class_type")) or {}).get("output_node")
+            for n in graph.values()
+        )
+        msg = (
+            "Built-in pipeline is disabled for this project and nothing is wired to the "
+            "🌐 Global video output. Wire a final IMAGE output to it, or re-enable the "
+            "built-in pipeline (Models → Enable built-in pipeline)."
+        )
+        if not has_output_node:
+            report["blocking"].append(msg)
+        report["unsatisfied"].append(msg)
 
     return graph, report
 

movie_editor/frontend/menubar.js

@@ -220,7 +220,10 @@
       ],
       Settings: [
         { label: "Editor settings…", action: () => window.EditorSettingsModal.open() },
-        { label: "Engine settings…", disabled: !hasProject() || (!studioOn && !chainOn),
+        // Never grey this out over pipeline state: the modal itself explains WHY Studio /
+        // Chain Sampler knobs are unavailable (built-in pipeline disabled, custom slots)
+        // and links to Models — a silently disabled item just looks broken.
+        { label: "Engine settings…", disabled: !hasProject(),
           action: () => window.EngineSettingsModal.open() },
         { label: "Temp files…", action: () => window.TempBrowserModal.open() },
         { sep: true },

movie_editor/frontend/pipeline_setup.js

@@ -232,7 +232,18 @@
     }
     const ownBtn = el("button", "btn", "No, I'll use my own pipeline");
     ownBtn.type = "button";
-    ownBtn.onclick = () => useOwnPipeline();
+    // This PERSISTS disable_core on the project — without a warning it read like a
+    // harmless "dismiss", then Generate failed ("no outputs") and Studio/Chain Sampler
+    // settings vanished with no visible cause.
+    ownBtn.onclick = () => {
+      if (!confirm(
+        "This DISABLES the built-in FunPack pipeline for this project and saves that choice.\n\n"
+        + "Generation will then run ONLY the nodes you wire yourself in Models — until you wire "
+        + "a final IMAGE to the 🌐 Global video output, Generate has nothing to run.\n\n"
+        + "You can re-enable it any time: Models → Enable built-in pipeline.\n\nContinue?"
+      )) return;
+      useOwnPipeline();
+    };
     foot.append(ownBtn);
     const dismissBtn = el("button", "btn ghost", "Close");
     dismissBtn.type = "button";

movie_editor/frontend/store.js

@@ -2758,6 +2758,8 @@
     [/\.clip.*no source/i,       "Missing text encoder — add a CLIP loader in Models."],
     [/not installed/i,           "A configured node class is not installed in ComfyUI — check Models for details."],
     [/Node registry unavailable/i, "ComfyUI is offline or still starting up — wait a moment and try again."],
+    [/prompt_no_outputs|Prompt has no outputs/i,
+      "The graph reached ComfyUI without any output node. Usually the built-in pipeline is disabled for this project (Models → Enable built-in pipeline), or your custom pipeline needs a final IMAGE wired to the 🌐 Global video output."],
     [/HTTP 53[0-9]|HTTP 52[24]|HTTP 502|Failed to fetch|NetworkError|Load failed/i,
       "Cloudflare tunnel lost contact with the vast.ai instance. GPU work may still be running — wait, refresh, and check ComfyUI output. If it keeps failing, use vast.ai direct port access or restart the tunnel."],
   ];