Irregular schema name incrementation

[buxx]

Currenlty

Some times, apispec.ext.marshmallow.common.get_unique_schema_name increment generated schema class (generated to manager "without fields").

Behavior can be found in test tests.func.fake_api.test_fake_api.test_func__test_fake_api_doc_ok__all_framework. See try/except AssertionError.

Expected

Identify reason of this irregularity and open a bug fix issue.