[AS] How to test the presence of at least one table?

Hello everyone,

I would like to test for the presence of at least one table in a document before starting a process (on edge strokes). 

I found this, but I do not know if this is really effective:

                              setCountOfTables1tocountoftablesofeverystory

                              setCountOfTables2toeverytableofeverystory

The first gives me a list of the number of table in each story; the second gives me the objects reference of every table.

Is there another way?

TIA.

Oli.