Don't fail when simulations_budget/index.json doesn't exist

src/scripts/clear_budget_simulations_cache.ts

@@ -7,6 +7,7 @@ const { simulationsBudgetDir } = config
 
 // Remove private budget simulations from index.
 const indexFilePath = path.join(simulationsBudgetDir, "index.json")
+if (fs.pathExistsSync(indexFilePath)) {
   const publicSimulationsSummary = (
     fs.readJsonSync(indexFilePath) as Array<{ public: boolean }>
   ).filter((summary) => summary.public)
@@ -14,6 +15,7 @@ fs.writeJsonSync(indexFilePath, publicSimulationsSummary, {
     encoding: "utf-8",
     spaces: 2,
   })
+}
 
 // Remove every budget simulations from cache.
 for (const dirName of await fs.readdir(simulationsBudgetDir)) {