Backport fix for handling empty csv file #771

Bump pre-release version to 3.3.3-a.2

Author: hardbyte

can/__init__.py

@@ -8,7 +8,7 @@
 
 import logging
 
-__version__ = "3.3.3-alpha.1"
+__version__ = "3.3.3-alpha.2"
 
 log = logging.getLogger('can')
 

can/io/csv.py

@@ -91,7 +91,11 @@ def __init__(self, file):
 
     def __iter__(self):
         # skip the header line
-        next(self.file)
+        try:
+            next(self.file)
+        except StopIteration:
+            # don't crash on a file with only a header
+            return
 
         for line in self.file: