When to add a pipe ‘|’

[hongyanfoxin]

In the read_verb_dictionary function of the PETRreader.py file, when reading a pattern line(from line 860 to line 956), i had found a difference between "#pre-verb prepositional phrase" and "#post-verb prepositional phrase".
When dealing with "#pre-verb prepositional phrase", we add a pipe '|' before the for
loop on line 896. But when dealing with "#post-verb prepositional phrase", we add the pipe '|' in the for loop on line 939.
I think the latter way is correct.
Is this a little bug or for some other reason?