Android signing alias empty

The preset has a signing configuration with an empty alias. Validation rejects it before packaging.

#Common causes

• signing.alias was omitted from the intended configuration or explicitly set to an empty string.

#Fixes

• Set signing.alias to the existing upload-key alias shown by keytool -list -keystore <project-upload.jks>.

• Code: ARA-EXP-AND-015 (slot 8059)

• Constant: export::AND_015

• Reported by: ara-export