Propagate workspace file lookup errors in write routing

Author: cursoragent

apps/sim/lib/uploads/contexts/workspace/workspace-file-manager.ts

@@ -320,7 +320,7 @@ export async function getWorkspaceFileByName(
     }
   } catch (error) {
     logger.error(`Failed to get workspace file by name "${fileName}":`, error)
-    return null
+    throw error
   }
 }