remote local config does not see existing remote

[shcheklein]

Bug Report

Please provide information about your setup

Output of dvc version:

DVC version: 1.1.10+1c9588
Python version: 3.8.4
Platform: macOS-10.15.4-x86_64-i386-64bit
Binary: False
Package: None
Supported remotes: azure, gdrive, gs, hdfs, http, https, s3, ssh, oss
Repo: dvc, git
Filesystem type (workspace): ('apfs', '/dev/disk1s1')

Additional Information (if any):

dvc remote add -d storage s3://storage
dvc remote modify storage region us-east-2 --local

complains:

ERROR: configuration error - config file error: remote 'storage' doesn't exists.

For example, it breaks the use case of using dvc remote modify to store credentials in the local config only.

[efiop]

This one is a known issue since the config refactor. Workaround is to simply first do:

dvc remote add storage s3://storage --local

[shcheklein]

just to let you know this breaks all the docs/examples