When no entity matches the <destinition player/entity> argument, if fails to send a command failed feedback when no [target player/entity] is specified.

Steps to reproduce: spawn a zombie that is not named bob123, and use the following commands in the chat:

/tp @p @e[type=Zombie,name=bob123]
/tp @e[type=Zombie,name=bob123]
/tp @p @e[name=bob123]
/tp @e[name=bob123]

As you may notice, when the [target player/entity] is not specified, no error message is made.