mvn db-migrator:drop should not throw error if database does not exist

[konstantsin123]

Now: mvn db-migrator:create throw an error if database already present.

Expected: mvn db-migrator:create throw a warning if database already present.

[ipolevoy]

Changing this to:

Now:

mvn db-migrator:drop 

throws an error if a database does not exist. If the Drop mojo just prints a warning, it will be easier to use it in scripts.

[ipolevoy]

deployed to Sonatype with version: 3.0-SNAPSHOT