Fix: Not raising an error for shortIndex.json not found

When the cache tries to update for the first time, the shortIndex.json
file is not present. Therefore, it prints an error when it tries to
delete it.

But if the file is already not present, that means the job of unlinking
is already complete. So not raising an error in that condition

Author: agnivade

lib/index.js

@@ -80,7 +80,11 @@ function clearPagesIndex() {
       clearRuntimeIndex();
     })
     .catch((err) => {
-      console.error(err);
+      // If the file is not present, then it is already unlinked and our job is done.
+      // So raise an error only if it is some other scenario.
+      if (err.code !== 'ENOENT') {
+        console.error(err);
+      }
     });
 }