Remove validation errors for missing .nss files

internal/validator/validator_test.go

@@ -97,6 +97,60 @@ func TestValidateProjectWarnsForUppercaseResourceNames(t *testing.T) {
 	}
 }
 
+func TestValidateProjectWarnsForMissingScriptReferences(t *testing.T) {
+	root := t.TempDir()
+	mustMkdir(t, filepath.Join(root, "src", "dialogs"))
+	mustMkdir(t, filepath.Join(root, "assets"))
+	mustMkdir(t, filepath.Join(root, "build"))
+
+	mustWriteFile(t, filepath.Join(root, "nwn-tool.json"), `{
+  "module": {
+    "name": "Test Module",
+    "resref": "testmod"
+  },
+  "paths": {
+    "source": "src",
+    "assets": "assets",
+    "build": "build"
+  }
+}
+`)
+	mustWriteFile(t, filepath.Join(root, "src", "dialogs", "merchant.dlg.json"), `{
+  "file_type": "DLG ",
+  "file_version": "V3.2",
+  "root": {
+    "struct_type": 0,
+    "fields": [
+      {
+        "label": "Script",
+        "type": "ResRef",
+        "value": "open_store"
+      }
+    ]
+  }
+}
+`)
+
+	p, err := project.Load(root)
+	if err != nil {
+		t.Fatalf("load project: %v", err)
+	}
+	if err := p.ValidateLayout(); err != nil {
+		t.Fatalf("validate layout: %v", err)
+	}
+	if err := p.Scan(); err != nil {
+		t.Fatalf("scan: %v", err)
+	}
+
+	report := ValidateProject(p)
+	if report.HasErrors() {
+		t.Fatalf("expected warnings only, got errors: %#v", report.Diagnostics)
+	}
+	if report.WarningCount() == 0 {
+		t.Fatalf("expected missing-script warning, got %#v", report.Diagnostics)
+	}
+}
+
 func mustMkdir(t *testing.T, path string) {
 	t.Helper()
 	if err := os.MkdirAll(path, 0o755); err != nil {