Less strict CSV processing, to allow dirty input.

bonobo/nodes/io/csv.py

@@ -1,4 +1,5 @@
 import csv
+import warnings
 
 from bonobo.config import Option
 from bonobo.config.options import RemovedOption
@@ -62,7 +63,7 @@ class CsvReader(FileReader, CsvHandler):
 
         for row in reader:
             if len(row) != field_count:
-                raise ValueError('Got a line with %d fields, expecting %d.' % (
+                warnings.warn('Got a line with %d fields, expecting %d.' % (
                     len(row),
                     field_count,
                 ))
@@ -81,6 +82,6 @@ class CsvWriter(FileWriter, CsvHandler):
         if not lineno:
             headers.set(headers.value or row.keys())
             writer.writerow(headers.get())
-        writer.writerow(row[header] for header in headers.get())
+        writer.writerow(row.get(header, '') for header in headers.get())
         lineno += 1
         return NOT_MODIFIED