You don't need an else here, else is if you want something else to happen usually. In this case you just want your action not to happen if the condition is not met.
Saying "If this is blue then do X" means that if it is not blue, X won't happen so there is no need for an else. Usually you use else if you have multiple options such as:
If this has color (condition)
(sub-condition)If this is Blue then do X
(Sub-condition)If this is Green then do Y
(sub-condition)If this is red then do z
Else Assign Random Color to this
Does that make sense? Else is usually if you want something to happen if none of the other conditions are met, otherwise meeting no conditions means that none of the conditions related actions would fire off.
You don't have to Say Do this else don't do this. If your condition isn't met it won't do it to begin with so you don't need an else in that case.