How can python identify empty strings in a list?

I am learning to create a block of 'if' statements to check certain conditions and I want them to identify if the list has empty quote marks in it.

so for example:

favourite_fruit = []

if len(favourite_fruits) == 0:
    print('Fruits are an important part of one's diet')
###This code works which is great as long as the list is empty in terms of it's length.

if the list isn't empty and they have something like: 'apple' in it, but another fruit like 'dates' is missing, then I would tell it to say:

if 'dates' not in favourite_fruit and len(favourite_fruit) != 0:
    print ('Have you tried Dates? They are high in fibre, a good source of which, can help prevent constipation by promoting bowel movements.') 

But the problem is if I type:

favourite_fruit = ['']

The length of this list is 1 but there is nothing in it so it will print out the dates quote but not the 'fruits are important' quote.

Is there a way for me to get python to identify there is nothing actually written in the list?

I am pretty much a beginner so I am still learning

Here is what I have tried though:

favourite_fruit = ['']

if 'dates' not in favourite_fruit and len(favourite_fruit) != 0 and favourite_fruit != "" and favourite_fruit != "\"\"" and favourite_fruit != '' and favourite_fruit != '\'\'':
    print ('Have you tried Dates? They are high in fibre, a good source of which, can help prevent constipation by promoting bowel movements.')

But it still isn't working.