How to Execute Oracle stored procedures at will

General Discussion
1

Currently, we have couple stored procedures in Liquibase that should only be called when the schema is empty.  How should we set this up correctly?

Option 1:  commented out the calls whenever we need to run liquibase in a non-empty schema (so that the test_create_data will not populate data again)?
I have tried this way, but it failed.  It would give me ‘Build failure’ error.

 
       
        call test_create_synonyms();
        call test_create_data();
 

Option 2: change any parameter setting? which one?

Thanks for your input!