Add even better check for undefined str parameter
Add even better check for undefined str parameter

melonmanchan/left-pad-services,melonmanchan/left-pad-services,melonmanchan/left-pad-services,melonmanchan/left-pad-services,melonmanchan/left-pad-services,melonmanchan/left-pad-services,melonmanchan/left-pad-services,melonmanchan/left-pad-services