Pagination/iteration bug: infinite loop after hitting end of results

[adamJLev]

To reproduce:

sem3 = Products('api_key', 'api_secret')
sem3.products_field('search', 'whatever')
sem3.products_field('cat_id', '4798')

for data in sem3.iter():
    pass
    # After end of results has been reached, this loop will go on forever

Here's what the API returns after the offset is higher than the number of results:

{u'code': u'OK',
 u'message': u'No results found; please modify your request.',
 u'offset': 505,
 u'results': [],
 u'results_count': 0,
 u'total_results_count': 722}

[adamJLev]

Actually this looks like a bug in the API side instead, if total_results_count is really 722, then passing an offset of 505 should still return results.

But the client should still do some sanity checking and stop iterating if no results are returned.