[css-syntax] Condition in "Parse a component value"

ED-2014-04-02:

5.3.6 Parse a component value
...
3. Consume a component value and let value be the return value. If 
nothing is returned, return a syntax error.


Under which condition does "Consume a component value" return nothing? 
There is no "Return nothing" in
* 5.4.6 Consume a component value
* 5.4.7 Consume a simple block
* 5.4.8 Consume a function

I think the sentence "If nothing is returned, return a syntax error." 
can be dropped.

-- 
Johannes Koch
In te domine speravi; non confundar in aeternum.
                             (Te Deum, 4th cent.)