Add graceful handling for missing bundle ID identifer on app-store-connect fetch-signing-files action

[priitlatt]

App Store Connect list bundle IDs API endpoint requires that parameter filter[identifier] is not an empty string. Currently this is not enforced by app-store-connect fetch-signing-files and can result in weird error message that does not translate well into executed CLI command.

Apply runtime parameter validation and raise an argument error in case empty identifier is used:

% app-store-connect fetch-signing-files ''
usage: app-store-connect [-h] [--log-stream {stderr,stdout}] [--no-color] [--version] [-s] [-v]
                   {app-store-version-localizations,app-store-version-phased-releases,app-store-version-submissions,app-store-versions,apps,beta-app-review-submissions,beta-build-localizations,beta-groups,buildsbundle-idget-bundle-icertificatedevicefetch-signing-files,get-latest-app-store-build-number,get-latest-build-number,get-latest-testflight-build-number,profilesdelete-profilpublish,review-submission-items,review-submissions}
                   ...
app-store-connect: error: argument bundle_id_identifier: Bundle ID identifier must be specified, empty values are not allowed. For example "com.example.app".

Updated actions:

• app-store-connect fetch-signing-files

[fran-tirapu]

LGTM