fix: emit an error when no linters enabled

[ldez]

I tested the following cases:

• default: none + enable with an explicit empty slice -> error
• default: none + enable with an explicit empty slice + formatters -> no error
• default: all + disable all linters -> error
• default: all + disable all linters + formatters -> no error
• default: standard + disable all linters -> error
• default: standard + disable all linters + formatters -> no error
• default: fast + disable all linters -> error
• default: fast + disable all linters + formatters -> no error

Fixes #6321