[COOK-2062] Remove backticks from database name

- remove backticks from database name when database_name attribute is nil
Merge pull request #23 from jhx/COOK-2062

[COOK-2062] Remove backticks from database name
release v1.3.8
#COOK-2117: Fix undefined variable "grant_statement"
Merge pull request #25 from michaelklapper/grant_statement

#COOK-2117: Fix undefined variable "grant_statement"
release v1.3.10