Correct way to treat if else with no else to do

Suppose I have an if clause to do something if condition == True and nothing if it's False. What would be the right way to put it? Like this:

beginning of code
if condition == True:
     do something
else:
     rest of the code

or should I omit the else statement like this:

beginning of code
if condition == True:
     do something
rest of the code

or maybe even like this:

beginning of code
if condition == True:
     do something
else:
     pass
rest of the code

The second one is surely shorter, but other than length of code is there a preferred way to do this?