importers.nbpy2017: Don't deal with refunds.

Only one refund was actually issued, so we can deal with that manually.  But
the code did its job of revealing those cases and checking we were handling
them well.

import2ledger/importers/nbpy2017.py

@@ -82,18 +82,16 @@ class Invoice2017:
     def _read_invoice_activity(self, table, first_row_text, rows_text):
         self.actions = []
         date_wordcount = self.DATE_FMT.count(' ') + 1
-        for timestamp, action, amount in rows_text:
-            if action.startswith('Paid '):
-                last_stripe_id = action.rsplit(None, 1)[1]
+        for timestamp, description, amount in rows_text:
+            if description.startswith('Paid '):
+                last_stripe_id = description.rsplit(None, 1)[1]
                 action = {
                     'multiplier': 1,
                     'payment_id': last_stripe_id,
                 }
-            elif action.startswith('Generated credit note '):
-                action = {
-                    'multiplier': -1,
-                    'payment_id': action.rsplit(None, 1)[1],
-                }
+            else:
+                # Refund handling could go here, if we need it.
+                continue
             # Trim extraneous text like the time/a.m./p.m.
             date_words = timestamp.split(' ', date_wordcount + 1)[:date_wordcount]
             action['date'] = util.strpdate(' '.join(date_words), self.DATE_FMT)
@@ -141,11 +139,3 @@ class Payment2017Importer(ImporterBase):
 
     def _should_yield_entry(self, entry):
         return entry['amount'] > 0
-
-
-class Refund2017Importer(ImporterBase):
-    TEMPLATE_KEY = 'template nbpy2017 refund'
-    INVOICE_CLASS = Invoice2017
-
-    def _should_yield_entry(self, entry):
-        return entry['amount'] < 0

tests/data/imports.yml

@@ -126,22 +126,3 @@
       payment_id: ch_daer0ahwoh9oDeiqu2eimoD7
       stripe_id: ch_daer0ahwoh9oDeiqu2eimoD7
       invoice_id: "11"
-
-- source: nbpy2017a.html
-  importer: nbpy2017.Refund2017Importer
-  expect: []
-
-- source: nbpy2017c.html
-  importer: nbpy2017.Refund2017Importer
-  expect:
-    - payee: Python Person C
-      date: [2017, 10, 8]
-      amount: "-55.00"
-      tickets_sold: "-1.0"
-      ticket_rate: "21.25"
-      shirts_sold: "-1.0"
-      shirt_rate: "25.50"
-      currency: USD
-      payment_id: "31"
-      stripe_id: ch_daer0ahwoh9oDeiqu2eimoD7
-      invoice_id: "11"