punctuation - Does removing the comma before 'which' etc in a non-restrictive clause change the meaning of the sentence?

There are many 'rules' on the net saying that a comma should be placed before the relative pronoun 'which' in a non-restrictive clause. (http://www.oxforddictionaries.com/words/relative-clauses)

But would the sentence have the same meaning without the comma before the relative pronoun?

Does omitting a comma before a relative pronoun change a nonrestrictive clause into a restrictive clause?

For example:

'We ate the pizza, which was nice.'

'We ate the pizza which was nice.'

If so does the same apply to relative pronouns other than 'which'?

Comments

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