A do nothing line in a bash script

The standard way to do it is using colon ::

if condition; do
  command
else
  :
fi

or true:

if condition; do
  command
else
  true
fi

But why not just skipping the else part:

if condition; do
  command
fi

---

In zsh and yash, you can even make the else part empty:

if condition; then
  command
else
fi

The else statement is optional. Just type:

if [ expr ]; then
#bla
#bla
#bla
fi