Fix denoland#158 handle properly dependencies cache when deno/deps do…

…es not exists

It handles ENOENT error thrown by the getAllDenoCachedDeps function when
the deno/deps directory does not exists (e.g. a deno fresh install).

Fix denoland#158

core/deno_deps.ts

@@ -31,7 +31,16 @@ export type Range = {
 export async function getAllDenoCachedDeps(): Promise<Deps[]> {
  const depsRootDir = getDenoDepsDir();
  const deps: Deps[] = [];
- const protocols = await fs.readdir(depsRootDir);
+ let protocols: string[] = [];
+
+ try {
+ protocols = await fs.readdir(depsRootDir);
+ } catch (error) {
+ //deno/deps directory does not exists
+ if (error.code === "ENOENT") {
+ return deps;
+ }
+ }
 
  await Promise.all(
  protocols.map(async (protocol) => {